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  • Fill Combo-box via DataSource Using Values from Various Columns

    - by peace
    Employee emp = new Employee(); comHandledBySQt.DataSource = emp.GetDataFromTable("1"); comHandledBySQt.DisplayMember = "FirstName"; The above code displays drop list of employees first names in a combo box. I want first name and last name to be displayed. How can i do it? I tried to include two columns FirstName and LastName as below but didn't work. comHandledBySQt.DisplayMember = "FirstName" + " " + "LastName"; Any help will be appreciated.

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  • Forcing a checkbox bound to a DataSource to update when it has not been viewed yet.

    - by Scott Chamberlain
    Here is a test framework to show what I am doing: create a new project add a tabbed control on tab 1 put a button on tab 2 put a check box paste this code for its code (use default names for controls) public partial class Form1 : Form { private List<bool> boolList = new List<bool>(); BindingSource bs = new BindingSource(); public Form1() { InitializeComponent(); boolList.Add(false); bs.DataSource = boolList; checkBox1.DataBindings.Add("Checked", bs, ""); this.button1.Click += new System.EventHandler(this.button1_Click); this.checkBox1.CheckedChanged += new System.EventHandler(this.checkBox1_CheckedChanged); } bool updating = false; private void button1_Click(object sender, EventArgs e) { updating = true; boolList[0] = true; bs.ResetBindings(false); Application.DoEvents(); updating = false; } private void checkBox1_CheckedChanged(object sender, EventArgs e) { if (!updating) MessageBox.Show("CheckChanged fired outside of updating"); } } The issue is if you run the program and look at tab 2 then press the button on tab 1 the program works as expected, however if you press the button on tab 1 then look at tab 2 the event for the checkbox will not fire untill you look at tab 2. The reason for this is the controll on tab 2 is not in the "created" state, so its binding to change the checkbox from unchecked to checked does not happen until after the control has been "Created". checkbox1.CreateControl() does not do anything because according to MSDN CreateControl does not create a control handle if the control's Visible property is false. You can either call the CreateHandle method or access the Handle property to create the control's handle regardless of the control's visibility, but in this case, no window handles are created for the control's children. I tried getting the value of Handle(there is no public CreateHandle() for CheckBox) but still the same result. Any suggestions other than have the program quickly flash all of my tabs that have data-bound check boxes when it first loads? EDIT-- per Jaxidian's suggestion I created a new class public class newcheckbox : CheckBox { public new void CreateHandle() { base.CreateHandle(); } } I call CreateHandle() right after updating = true same results as before.

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  • Invalid URI: The format of the URI could not be determined.

    - by j-t-s
    Hi ALl I keep getting this error. Invalid URI: The format of the URI could not be determined. the code I have is: Uri uri = new Uri(slct.Text); if (DeleteFileOnServer(uri)) { nn.BalloonTipText = slct.Text + " has been deleted."; nn.ShowBalloonTip(30); } What gives? How is that not a valid URI format? It's plain text.

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  • Error : while creating a file.

    - by Harikrishna
    I am storing records of datatable to csv file with the help of the following code : // we'll use these to check for rows with nulls var columns = yourTable.Columns .Cast<DataColumn>(); using (var writer = new StreamWriter(yourPath)) { for (int i = 0; i < yourTable.Rows.Count; i++) { DataRow row = yourTable.Rows[i]; // check for any null cells if (columns.Any(column => row.IsNull(column))) continue; string[] textCells = row.ItemArray .Select(cell => cell.ToString()) // may need to pick a text qualifier here .ToArray(); // check for non-null but EMPTY cells if (textCells.Any(text => string.IsNullOrEmpty(text))) continue; writer.WriteLine(string.Join(",", textCells)); } } But I get the error like System.UnauthorizedAccessException was unhandled Message="Access to the path 'D:\\Harikrishna\\Monthly Reports' is denied." What can be the problem and solution ?

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  • Cannot edit values of DataGridView bound to a BindingList

    - by m_oLogin
    Hello community, I have trouble editing a databound bindinglist. Let me illustrate it with the following: Say I have the Person class: public Class Person{ private string m_firstname; private string m_lastname; public string FirstName{get;set;} public string LastName{get;set;} public Person{ ... } } I then have a containing class called Population: public class Population{ private BindingList<Person> m_lstPerson = new BindingList<Person>(); private string m_countryName; public BindingList<Person> ListPerson{get; set;} public string CountryName { get; set; } } I then have on one form a first datagridview with DataSource = m_lstPopulation (BindingList). The binding works like a charm when working with the Population objects. When I double click, it opens up a dialog form showing the object details. One tab in the details holds a datagridview bound to that population's ListPerson. The second datagridview displays fine. However, I cannot edit or add cells in this datagridview. None of the columns is set to read-only. In fact, both datagridview have just about the same parameters. What am I missing? It seems that a lock has been placed on the Population object so that its inner fields cannot be edited... Please advise. Thanks.

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  • Graphics.FromHwnd(IntPtr.Zero) returns null, why?

    - by Martin Moser
    I'm currently investigating a problem with a 3rd party component (DevExpress) in my application. My issue is quite similar to this one DevExpress KB article. I get the same exception with more less the same stacktrace. So I used .NET Reflector to find out, what may be null in this scenario, and the only object which is a candiate to be null is Graphics. This is created with Graphics.FromHwnd(IntPtr.Zero). Because I don't have a broad knowledge about GDI, I would like to know if somebody can tell me possible scenarios when this may return null... I tried to reproduce it in a scenario where windows is out of GDI handle's, but then I'm getting a "out of handles" - exception at least once, which is not the case in the issue I'm investigating tia, Martin

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  • User controls do not properly fit on the screen

    - by Royson
    Hi, My application has several controls. Like in one screen has TreeView on left side, GridView with paging in the middle and 4 buttons at right side. The controls properly appear when the form is in a maximized state, but if I minimize it the controls do not properly fit on the screen. I tried with different different tricks like table layout.. in dat I added a panel, etc... But I could not solve the problem. How can I create such type of screens which fits independently of size of my window? Thanks

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  • Html tidy pack replaces `&lt` instead of `< `and `&gt` instead of `>` for html tag.

    - by Harikrishna
    I am tidying the html page by html tidy pack because there are some pages with missing ending tags So I can add the missing closing tags by html agility pack. But some times when I use the html tidy pack then that web page has changes like : If original table is <table><tr><td>first row</td></table> After using html tidy pack the table is : <table> is now &lt table &gt. But I want like <table>. In this particular example it works perfectly but in some html page it replace &lt instead of <and &gt instead of >.

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  • Current Line For Visual Studio Macros

    - by Vadim
    How can I read text of a current line (where cursor is situated) from Macros? I'm going to use such a fucntion: Public Sub AddTextToChangeLogFile() Dim textOnACurrentLine As ??? textOnACurrentLine = ??? If textOnACurrentLine.Text <> String.Empty Then Dim sw As New StreamWriter("C:\###\Changes.txt", True) sw.WriteLine(textOnACurrentLine + ". file: " + DTE.ActiveDocument.Name) sw.Close() End If End Sub

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  • How to set source path of image within html pages to show in webbrowser control

    - by Royson
    Hi in my application there is web browser control to show some static html pages. The pages are displayed properly. but images are not displayed.. I tried with changing src-path but no success. my htmlpages folder is located at bin folder. And i am assigning it as. FileStream source = new FileStream(@"..\HtmlPages\supportHtml.html", FileMode.Open, FileAccess.Read); if i open html files in browser, the images are displayed properly.. So, What is the correct path for images..?? If i set full path to src attribute of <img> tag..it works. but i think its not a proper way. :( EDIT: If i assign d:\myapp\bin\HtmlPages\support.gif then image is displayed. And if i assign "..\HtmlPages\support.gif" or "support.gif" image is not shown.

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  • add row to a BindingSource gives different autoincrement value from whats saved into DB

    - by Ruben Trancoso
    I have a DataGridView that shows list of records and when I hit a insert button, a form should add a new record, edit its values and save it. I have a BindingSource bound to a DataGridView. I pass is as a parameter to a NEW RECORD form so // When the form opens it add a new row and de DataGridView display this new record at this time DataRowView currentRow; currentRow = (DataRowView) myBindindSource.AddNew(); when user confirm to save it I do a myBindindSource.EndEdit(); // inside the form and after the form is disposed the new row is saved and the bindingsorce position is updated to the new row DataRowView drv = myForm.CurrentRow; avaliadoTableAdapter.Update(drv.Row); avaliadoBindingSource.Position = avaliadoBindingSource.Find("ID", drv.Row.ItemArray[0]); The problem is that this table has a AUTOINCREMENT field and the value saved may not correspond the the value the bindingSource gives in EDIT TIME. So, when I close and open the DataGridView again the new rowd give its ID based on the available slot in the undelying DB at the momment is was saved and it just ignores the value the BindingSource generated ad EDIT TIME, Since the value given by the binding source should be used by another table as a foreingKey it make the reference insconsistent. There's a way to get the real ID was saved to the database?

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  • Why does TabStop stop working??

    - by Jerry
    I have a project that uses a series of auto-generated user control instances. The user-control itself exists, but I populate a panel with a series of these user controls, one for each item in my collection. Each user control displays a ton of information, but only ONE text field is editable. All of the other fields have TabStop set to false, and are marked as ReadOnly. The tab order of each user control is set at the time it is created so that the tab-key goes from one field to the next (or ... it's supposed to). When I have TWO fields on my user control whose TabStop is set to true, everything works great. But if I only have ONE field whose TabStop is true, the tab key stops working, and I have to physically CLICK on the next user control for it to gain focus. What's up? Has anyone else seen this behavior? Am I doing something stupid as usual?

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  • help me to cheat with numericUpDown1_ValueChanged event

    - by alex
    I have a Form and numericupdown control located on it. I want that in some conditions (_condition1) user cannot be able to change a value of numericupdown control. How can I do it ? I wrote some code but it works twice (double time). class Form1 : Form { bool _condition1; int _previousValue; void numericUpDown1_ValueChanged(object sender, EventArgs e) { if(_condition1) { numericUpDown1.Value = (decimal)_previousValue; } else { _previousValue = (int)numericUpDown1.Value; } } } Control must be enable.

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  • Why does this IF statement fail?

    - by ChosenOne
    If variable path is empty, and editor.Text is not empty, the SaveFileDialog should be displayed. Now, why on earth is this damn thing failing??? I have tried this with many different variations of code with the same result: FAIL: if(path.Length >= 1) // path contains a path. Save changes instead of creating NEW file. { File.WriteAllText(path, content); } else { // no path defined. Create new file and write to it. using(SaveFileDialog saver = new SaveFileDialog()) { if(saver.ShowDialog() == DialogButtons.OK) { File.WriteAllText(saver.Filename, content); } } } At the top of code file I have: path = String.Empty; So why the heck it this failing every single time, even after trying all of the below variations? if(path.Length > 1) // path contains a path. Save changes instead of creating NEW file. { File.WriteAllText(path, content); } else { // no path defined. Create new file and write to it. using(SaveFileDialog saver = new SaveFileDialog()) { if(saver.ShowDialog() == DialogButtons.OK) { File.WriteAllText(saver.Filename, content); } } } and if(String.IsNullOrEmpty(path)) // path contains a path. Save changes instead of creating NEW file. { File.WriteAllText(path, content); } else { // no path defined. Create new file and write to it. using(SaveFileDialog saver = new SaveFileDialog()) { if(saver.ShowDialog() == DialogButtons.OK) { File.WriteAllText(saver.Filename, content); } } } and if(String.IsNullOrWhiteSpace(path)) // path contains a path. Save changes instead of creating NEW file. { File.WriteAllText(path, content); } else { // no path defined. Create new file and write to it. using(SaveFileDialog saver = new SaveFileDialog()) { if(saver.ShowDialog() == DialogButtons.OK) { File.WriteAllText(saver.Filename, content); } } } This is making me very angry. How could this fail? Setting a break point reveals that path is definitely null/"".

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  • Working examples of winform/WPF apps

    - by melody
    I'm a user interface designer. The project I'm working on is a dashboard that will have several interactive and customizable widgets (think Netvibes, etc.). The development group is going to be using either WinForm or WPF to build the dashboard and widgets. I need to understand the capabilities of each technology better and see a sampling of actual working apps to help accomplish this. I can't download and build examples... need live examples somewhere on the web. Can you point me to live, existing apps? Thx.

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  • Creating user control with dock.Full property giving me a problem

    - by Royson
    Hi, My application has several controls. Like in one screen has treeview on left side,gridview with paging in the middle and 4 buttons at right side. the controls are properly appears when the form is in maximize state. but if i minimize it the controls are not properly fits in the screen. i tried with different different tricks like table layout.. in dat i added panel...etc.. but i could not solve the problem. How can i create such type of screens which fits independent of size of my window. Thanks

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  • How to change Arrow Keys Behavior?

    - by SO give me back my rep
    Hi, I am doing a cool menu (sorta XMB) to give a fresh touch to my app... I add all of the elements on the menu programatically via DB. the menu is designed for easy use with arrows keys but I have encountered a major problem!!! by default when I press the arrow keys they only change the focus based on the tabindex and what I need is to change focus based on position of the controls not on their tabindex hope it is clear... see pic!!! so, Is there any way to do this?

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  • TabControl winform c#

    - by Steve
    Hi, Does anyone know why my tabcontrol will not display on this form? Have a feeling it maybe something simple but at the moment i just get a blank form. Thanks using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace test_project_3 { public partial class TabTest : Form { public TabTest() { InitializeComponent(); WebBrowser WB = new WebBrowser(); WB.Navigate("www.google.com"); TabControl tc = new TabControl(); tc.Dock = DockStyle.Fill; tc.Show(); TabPage tp = new TabPage(); tp.Text = "test"; tp.Show(); tp.Controls.Add(WB); tc.TabPages.Add(tp); } } }

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  • A good way in Visual Studio to have user entered time frame?

    - by Ben
    Hi, Does anyone know of a good way to have a user enter an amount of time (hours and minutes) using visual studio controls? At the moment i have two numeric up downs, one for time and one for minutes that i then parse to create a timespan. The only other idea i have is a text box that a user can enter a "00:00" time in, and validate the input. Both of these ways seem a bit bad (in UI terms) though. Any ideas? Thanks

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  • [C#][XNA 3.1] How can I host two different XNA windows inside one Windows Form?

    - by secutos
    I am making a Map Editor for a 2D tile-based game. I would like to host two XNA controls inside the Windows Form - the first to render the map; the second to render the tileset. I used the code here to make the XNA control host inside the Windows Form. This all works very well - as long as there is only one XNA control inside the Windows Form. But I need two - one for the map; the second for the tileset. How can I run two XNA controls inside the Windows Form? While googling, I came across the terms "swap chain" and "multiple viewports", but I can't understand them and would appreciate support. Just as a side note, I know the XNA control example was designed so that even if you ran 100 XNA controls, they would all share the same GraphicsDevice - essentially, all 100 XNA controls would share the same screen. I tried modifying the code to instantiate a new GraphicsDevice for each XNA control, but the rest of the code doesn't work. The code is a bit long to post, so I won't post it unless someone needs it to be able to help me. Thanks in advance.

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  • SmtpClient.SendAsync(); Not working on my new (64bit) computer.

    - by j-t-s
    Hi All, Okay, Only a couple weeks ago I had an old 32bit computer, but had to buy a new computer, which happens to be 64bit. I've rewritten the method that sends e-mails asynchonously and it just does not work. And does NOT throw any exceptions either. What gives? I have also tried the Async method code found iin MSDN, and the BlackWasp tutorial code, and MANY others. They're all the same! The only difference here seems to be the fact that I'm now on a 64bit computer. How can I get around this? Google/MSDN has been of zero help. Thanks

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