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• concatenating results from SQL query and NULL columns

  - by Curtis

  I need to concatenate several columns of a table into a single value, then show that value in an asp dropdownlist. The SQL code I'm issuing is as follows: SELECT UserID, CustomerNum, UserName + ' - ' + UserAddress + ',' + UserCity + ' ' + UserState AS UserInfo FROM Users WHERE (CustomerNum = @CustomerNum) ORDER BY UserName I then set 'UserInfo' as the text field in the dropdownlist. This generally works, except occasionally one of the columns in the database is null (for example, UserState). When that happens, the entire concatenation is null, and I get an empty entry in the dropdownlist. Is there something in SQLServer that will allow me to ignore those NULL results, or will I have to code something up in the DataBind event? Thanks

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• ASP.NET - DropDown DataBinding (Rebind?)

  - by Bob Fincheimer

  I have a drop down which has a method which binds data to it: dropDown.Items.Clear() dropDown.AppendDataBoundItems = True Select Case selType Case SelectionTypes.Empty dropDown.Items.Insert(0, New ListItem("", "")) Case SelectionTypes.Any dropDown.Items.Insert(0, New ListItem("ANY", "")) Case SelectionTypes.Select dropDown.Items.Insert(0, New ListItem("Select One", "")) End Select BindDropDown(val) The BindDropDown method simply sets the datasource, datakeyname, datavaluename, and then databinds the data. For a reason which I cannot avoid, I MUST call this method twice sometimes. When it is called twice, All of the databound items show up two times, but the top item (the one I manually insert) is there only once. Is ASP doing something wierd when i databind twice even though i clear the list between? Or does it have to do something with the viewstate/controlstate? EDIT__ The entire page, and this control has EnableViewState="false" EDIT___ The dropdown is inside a form view. After the selected value is set I have to rebind the dropdown just in case the selected value is not there [because it is an inactive user]. After this, the formview duplicates the databound items.

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• Manipulating individual rows of a datagrid

  - by pfranchise

  Hey, recently I started working on a webpage that has a datagrid. I understand how to add datasources and that sort of thing, or at least I am starting to get it. But my question is about manipulating individual rows or cells. Is that only possible during the databind event handler, that is the only place I have been able to do it so far. I am sure there is a more abstract way of doing the things I want to do, but there are times where I just want to say Datagrid.add(row). I mean, if the datagrid is made up of a certain object type, can I make a new object of that type and just chuck it on the end? I am still new to this stuff, so perhaps what I want to do would defeat the purpose of this added abstraction, but figured I would ask around. Thanks for any advice, tips, or tricks people feel like sharing. Edit: for clarification I am using c#, entity framework, asp.net, and an SQL database.

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• data is not getting ordered by date

  - by raging_boner

  Can't get list sorted by date. How to show data ordered by date? XDocument doc = XDocument.Load(Server.MapPath("file.xml")); IEnumerable<XElement> items = from item in doc.Descendants("item") orderby Convert.ToDateTime(item.Attribute("lastChanges").Value) descending where item.Attribute("x").Value == 1 select item; Repeater1.DataSource = items; Repeater1.DataBind(); Xml file looks like this: <root> <items> <item id="1" lastChanges="15-05-2010" x="0" /> <item id="2" lastChanges="16-05-2010" x="1" /> <item id="3" lastChanges="17-05-2010" x="1" /> </items> </root>

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• Treeview DatafieldParentID Bind to Object whose property is a another object

  - by user228777

  I am trying to bind Generic collection to a Rad Treeview control. In following case CategoryCollection Returns collection of Category Object, which has bunch of properties and A Parent property which is a object and this parent object Has Id and text properties. What I am trying to do is: I want to Bind DataFieldParentID of the tree view to CategoryCollection.Parent.Id. How do I do that? Dim tvCategory As RadTreeView = DirectCast(cboCategory.Items(0).FindControl("tvCategory"), RadTreeView) With tvCategory .DataSource = CategoryCollection .DataTextField = "Name" .DataValueField = "ID" .DataFieldID = "ID" .DataFieldParentID = "Parent.ID" .DataBind() End With Thank You

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• C#: Changing the order of columns when binding DataTable to a GridView

  - by Nir

  How is it possible to change the displayed order of columns from a DataTable? For example, dataTable "dt" contains two columns "a" and "b". I bind it to a GridView like this: gridView.DataSource = dt; gridView.DataBind(); But I'd like the GridView to display "b" first (leftmost). Important point: I'm using this to export to Excel and there's no actual output to screen, using: HtmlTextWriter htw = new HtmlTextWriter(sw); gridView.RenderControl(htw); Thanks!

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• How to programatically create a xaml panel with controls

  - by randy

  Hello, Is it possible to programatically create a new panel within a current document that contains duplicate elements? For example when the window loads I have a grid (one row) with three text fields, Fname01, Lname01, and DOB01, I would like to have a button that when clicked would append a new row to the grid with three new fields (Fname02, Lname02, and DOB02). Each time the button is clicked (addrow) a new row would be created. I am also interested to learn how these fields are identified within the xaml that would allow me to databind or programatically reference the created fields for insertion of the values into a database etc. Thank you in advance,

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• tabcontainer button postback problem

  - by yousof

  I have a dropdownlist in my web page and two command buttons and a tabcontainer. The tabcontainer does not appear after the load of page according to my code. Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then TabContainer1.Visible = False If CtvAct.GetRecords("Fill_RequestTypeTb") = True Then ReqTypeCmbo.DataSource = CtvAct.MainDataset.Tables("tbOLRequestType").DefaultView ReqTypeCmbo.DataTextField = "RequestTypeName" ReqTypeCmbo.DataValueField = "RequestTypeId" ReqTypeCmbo.DataBind() Dim itm As New ListItem itm.Text = "-- ??? ??? ????? --" itm.Value = "-1" itm.Selected = True ReqTypeCmbo.Items.Insert(0, itm) ReqTypeCmbo.SelectedIndex = 0 End If End If End Sub Protected Sub PrntCmd_Click(ByVal sender As Object, ByVal e As EventArgs) Handles PrntCmd.Click TextBox6.Text = "gggg" End Sub If I press any button after page load the button work very selecting any item from dropdownlist make the tabcontainer appear but after the tabcontainer appear, the buttons does not work (postback) how can I solve these problems

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• Concatenate Two Fields to Display in Dropdown List

  - by Locke12

  Hi, I am trying to concatenate two fields from a list to display in a dropdown. Below is the code i am trying to use. I don't want to change the model of my products so I was trying to do something like that below but I can't figure anything out without building out my own object with the fields concatenated. skuDropDown.DataSource = List<product> skuDropDown.DataTextField = "ProductId" // want to combine with"Description"; skuDropDown.DataValueField = "ProductId"; skuDropDown.DataBind(); Thanks any ideas will help.

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• Treeview Slow in IE?!?!

  - by Mike

  I have a treeview with around 200 records that needs to be fully expanded at all times (so no loading on demand). It is inside of an update panel with the updatemode set to conditional. There are other update panels on the page as well that are set to conditional. Depending on user actions the tree may need to be rebuilt by calling databind and updating the updatepanel. Everything works fine in firefox, longest postback about 2 seconds. With IE I have to wait up to 30 seconds sometimes and the action may have nothing to do with the tree just changing a dropdown in its own updatepanel takes forever. I have considered the size of viewstate and just raw HTML generated may be causing the delay but wouldn't that effect both browsers? Anyone have anyideas what is making it so slow in IE??? Thanks!

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• Using MicrosoftReportViewer with Web Forms programmatically

  - by user283897

  Hi, I'm repeating my question because the prior one under this topic was lost. Could you please help me? I want to use MicrosoftReportViewer for Web Forms so that the DataSource be set programmatically. There is some sample code on the Internet for Windows Forms but I haven't found anything for Web Forms. For example, here is some code I've tried to use. It gives no errors but nothing is displayed. How should I modify the code to display a table in the ReportViewer? Imports System.Data Imports Microsoft.Reporting.WebForms Partial Class TestReportViewer Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load CreateReport() End Sub Sub CreateReport() Dim dt As DataTable Dim rpt As ReportDataSource dt = New DataTable("Sample") With dt .Columns.Add("No", GetType(Integer)) .Columns.Add("Name") .Rows.Add(1, "A1") .Rows.Add(2, "A2") .Rows.Add(3, "A3") .Rows.Add(4, "A4") .AcceptChanges() End With rpt = New ReportDataSource rpt.DataMember = "Sample" rpt.Value = dt rpt.Name = "test" With ReportViewer1 .LocalReport.DataSources.Add(rpt) .DataBind() .LocalReport.Refresh() End With End Sub End Class

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• Dynamic query to immediate execute?

  - by Curtis White

  I am using the MSDN Dynamic linq to sql package. It allows using strings for queries. But, the returned type is an IQueryable and not an IQueryable<T>. I do not have the ToList() method. How can I this immediate execute without manually enumerating over the IQueryable? My goal is to databind to the Selecting event on a linqtosql datasource and that throws a datacontext disposed exception. I can set the query as the Datasource on a gridview though. Any help greatly appreciated! Thanks. The dynamic linq to sql is the one from the samples that comes with visual studio.

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• Drop Down List In A Gridview

  - by Or Betzalel

  I have a gridview, inside the gridview I have a template field and inside that, a drop down list. <asp:TemplateField> <ItemTemplate> <asp:DropDownList ID="Hello" runat="server"> </asp:DropDownList> </ItemTemplate> </asp:TemplateField> I want to databind the gridview but how do I make the drop down list change its value to according to the information I gave it while databinding? Im used to using DataField in bound fields <asp:BoundField HeaderText="Hello" DataField="HelloDB" />

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• dropdown list selected index changed

  - by KareemSaad

  I did my drop down list that get it,s values from database and when run the application it didnot work and compiler didnot see the code onselectedindexchanged="DDlProductFamily_SelectedIndexChanged" protected void DDlProductFamily_SelectedIndexChanged(object sender, EventArgs e) { using (SqlConnection Con = Connection.GetConnection()) { SqlCommand Com = new SqlCommand("SelectThumbByProductFamily", Con); Com.CommandType = CommandType.StoredProcedure; Com.Parameters.Add(Parameter.NewInt("@ProductCategory_Id", DDlProductFamily.SelectedValue.ToString())); SqlDataAdapter DA = new SqlDataAdapter(Com); DA.Fill(dt); DataList1.DataSource = dt; DataList1.DataBind(); } }

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• How to make DropDownList automatically be selected based on the Label.Text

  - by Archana B.R

  I have a DropDownlist in the GridView, which should be visible only when edit is clicked. I have bound the DropDownList from code behind. When I click on Edit, the label value of that cell should automatically get selected in the DropDownList. The code I have tried is: protected void GridView3_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { SqlCommand cmd = new SqlCommand("SELECT Location_Name FROM Location_Table"); DropDownList bind_drop = (e.Row.FindControl("DropList") as DropDownList); bind_drop.DataSource = this.ExecuteQuery(cmd, "SELECT"); bind_drop.DataTextField = "Location_Name"; bind_drop.DataValueField = "Location_Name"; bind_drop.DataBind(); string Loc_type = (e.Row.FindControl("id2") as Label).Text.Trim(); bind_drop.Items.FindByValue(Loc_type).Selected = true; } } When I run the code, it gives an exception error Object reference not set in the last line of the above code. Cannot find out whats wrong. Kindly help

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• how to change the filed while showing on the grid?

  - by rockers

  helo friends, I am new to Asp.net mvc.. I have a column called Indicator in the data base..that has Y or N this is the code I am using to get the field from data base.. Indicator= !dr.IsDBNull(8) ? dr.GetString(8) : null, In my entity class i have the filed public string Indicator { get; set; } while to assing the grid I am doing soemthing like this var result = (from e in A.List.AsQueryable() select new { Indicator= e.Indicator, }); return gridModel.ListGrid.DataBind(result); But on the grid I am seeing Y and N.. but Yesterda of that if it return Y I need to show them YES if it is N i need to show them NO where do I need to change this? thanks

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• Asp.net Page and control Events

  - by andrewWinn

  I have looked all over the web and I can not find the information I am looking for and I was hoping that someone could give me a hand. Specifically, I am looking for a comprehensive list of what events occur in the page and control life cycles and what is "available" in each event. Like when can I get a dropdownlists selected value, when can i databind, when can I get at values in view state and what not. Can anyone point me to a comprehensive list for both page and control life cycles? Or even provide that information for me? Thanks in advance.

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• Databinding and Lists in instances of classes

  - by Younes

  I have initialised an instance of a class i have called "Relation" this class also contains a list of "Bills". When i databind this information to a grid, the Relations are showing, tho the Bills ain't. The Relation information is returning in a List and the Bills are inside. Relation cRelation = new Relation(); List<tRelation> relationList = cRelation.getRelations(); a relation has: relation.Bills <== List<tBills>; How to make sure that the list inside the list is also getting showed in the Datagrid?

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• Updating my database

  - by Malcolm

  I am new with the subsonic, and I have a problem when trying to update the database from the sql server. I have created a gridview by still is not returning the updates results. can you please help me? its getting an error code on dc.AddMostaHse(); (Cannot implicity convert type 'void to 'object') Here is the code being done of DataAccess.cs page public void AddMostaHse() { Mosta.MostaHSE1 xx = new MostaHSE1(); xx.ID = 94; xx.FunctionLocation = "lza94"; xx.acno = 12; xx.Save(); } Binding it with the gridview. { DataAccess dc = new DataAccess(); gvtest.DataSource = dc.AddMostaHse(); gvtest.DataBind(); }

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• Event is causing an error, but I can't catch the exception

  - by proudgeekdad

  A developer has created a custom control in ASP.NET using VB.NET. The custom control uses a repeater. In certain scenarios, the rpt_ItemDataBound event is encountering a data error. My goal is rather than having the user see the yellow screen of death, give the user a friendlier error explaining exactly what the data error is. I figured I would be able to use a Try/Catch block as shown below throw the exception, however, it appears that the event has nowhere to be thrown to and stops executing at the "End Try" line. Protected Sub rpt_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles rpt1.ItemDataBound, rpt2.ItemDataBound Try ProcessBadData... Catch ex As Exception Throw ex End Try End Sub In VB.NET, I can find where the repeater's DataSource is being set, however, I can not find a DataBind event. Any ideas how I can capture the exception in this ASCX control so I can report it to the user?

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• how to get empty row in DropDownList

  - by Gali

  hi i have this citys in my database: city1 city2 city3 city4 i what to see this in my DropDownList: [empty] city1 city2 city3 city4 this is my bind code: SQL = "select distinct City from MyTbl order by City"; dsClass = new DataSet(); adp = new SqlDataAdapter(SQL, Conn); adp.Fill(dsClass, "MyTbl"); adp.Dispose(); DropDownList3.DataSource = dsClass.Tables[0]; DropDownList3.DataTextField = dsClass.Tables[0].Columns[0].ColumnName.ToString(); DropDownList3.DataValueField = dsClass.Tables[0].Columns[0].ColumnName.ToString(); DropDownList3.DataBind(); how to do it (asp.net C#) ? thanks in advance

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• insert DropDownList and TextField in Gridview

  - by userk

  HI,I need to create a GridView which DataSource is an object. Depending on the object I may need some columns with DropDownLists or TextFields (but not all rows) As I don't know the number or columns, they have to be dynamic. I found this solution: TemplateField t = new TemplateField(); t.HeaderTemplate = new GridViewTemplate("header", "title"); t.ItemTemplate = new GridViewTemplate("combobox", "val"); GridView1.Columns.Add(t); GridView1.DataSource = ds; GridView1.DataBind(); Where GridViewTemplate extends ITemplate. This didn't work for me, it fills all rows of a column and I had no way to control witch DropDownList and TextFields need to be created (object info). All the DropDownLists need to have an ID also only known by the object. There are some way I can do this?

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• Dynamically add rows to listbox

  - by Ivan S

  I have a list box that displays information off of a column of a dataset. I would like the number of rows displayed to be all the rows that are in the dataset (the number of datasets in the rows vary). I'm figuring it has something to do with ListBox.Rows = Dataset.Tables[0].Rows.Count; But it seems to just always default to 4 even when it is only 2. This is what I have in my aspx.cs file. pirateBox.DataTextField = Pirateship.Tables[0].Columns["displayName"].ToString(); pirateBox.DataValueField = pirateship.Tables[0].Columns["PKID"].ToString(); pirateBox.DataSource = pirateship.Tables[0]; pirateBox.DataBind(); pirateBox.Rows = pirateship.Tables[0].Rows.Count; I've been trying a few things and this is what I have so far in .aspx <asp:ListBox ID="pirateBox" runat="server" Rows="1"></asp:ListBox>

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• Show data relationship in gridview with dropdownlist or similar?

  - by Anders Svensson

  I have data coming from two tables with a foreign key relationship - one User table containing users of the web application, and one Page table containing details about pages visited by each user. I would like to be able to view these data in a gridview or the like on a page. It's easy enough to just show the User table data like so (I'm using the Entity Framework and LINQ): UserDBEntities context = new UserDBEntities(); GridView1.DataSource = from user in context.UserSet select new { user.Ip, user.Count, user.Description, user.Referer }; GridView1.DataBind(); But how can I show the Page details? I'm not bent on any particular way of showing it, but the only idea I've been able to come up with is to have a dropdown list for each user in a column. But I can't figure out how to get the page data into such a dropdown list. The tables are associated with the primary/foreign key UserID. Any ideas would be welcome (dropdownlist solution or other)!

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• Linq databinding issue....data doesnt show up in gridview ...I get the message that number and name field are not found in the data source

  - by Chandan Khatwani

  List<Emp> employees = new List<Emp>(); Emp e1 = new Emp(); e1.number = 2; e1.name = "Dinesh"; employees.Add(e1); Emp e2 = new Emp(); e2.number = 3; e2.name = "Vishal"; employees.Add(e2); var query = from n in employees orderby n.name descending select n; GridView1.DataSource = query; GridView1.DataBind();

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