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• Is there a way to delay an event handler (say for 1 sec) in Windows Forms

  - by Essam

  I need to be able to delay the event handlers for some controls (like a button) to be fired for example after 1 sec of the actual event (click event for example) .. is this possible by the .net framework ? I use a timer and call my code from the timer's tick event as below but I am not sure if this is the best approach ! void onButtonClick( ..) { timer1.Enabled = true; } void onTimerTick( ..) { timer.Enabled = false; CallMyCodeNow(); }

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• WPF User Control is causing Out of Memory Exception

  - by Chairman Meow

  Looking for a free spell checking solution, I thought I was so smart in doing this but I guess not. I have created a windows form based application and I want the form to add a user specified amount of user controls (with textboxes) on to a panel. The user can then click some button and the controls on this panel are cleared and new ones are added. The user does something and the process is repeated. Now, I wanted these textboxes to support spell checking and looked all over for a free solution. WPF textboxes support spell checking where the ones in regular win forms do not. I thought I would be able to use these WPF textboxes by adding them to an ElementHost object which is, in turn, within a panel. This panel would be a user control. So, in my application, I would be able to add instances of these user controls onto the form and make use of .NET's spell checking goodness. This actually worked but after using the application for a while, found that the application would eventually freeze on me due to out of memory errors. I have pinpointed the memory errors to these WPF controls since this problem does not happen with normal textboxes. When the window is opened and the number of controls is specified, this is pretty much how the controls are added: Dim xOffset As Integer = 0 For i As Integer = 0 To theNumber Dim myUserControl As New SpecialUserControl() myPanel.Controls.Add(myUserControl) myUserControl.Location = New Point(7, 7) myUserControl.Location = New Point(xOffset, 7) xOffset = xOffset + 207 Next Note that: myPanel is a panel on a form SpecialUserControl is the user control with WPF textbox (within an ElementHost object) When the user pressed a button, the panel is cleared: myUserControl.Controls.Clear() The user can then repeat the process. There are a lot of results on the internet when I tried to find a solution and I'm thinking that the problem I am having is due to the fact that the WPF control is not going away even after clearing the panel. Following this conclusion, I have tried different solutions regarding disposing these controls or setting them to nothing but the memory problem keeps occurring. If someone could give me some advice or ideas here, I'd really appreciate it.

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• C#: Change DropDownList value when Enter key is pressed

  - by Addie

  I have a windows form with a DropDownList with a fixed number of items. How do I make the DropDownList increment to the next item when I press Enter and when it reaches the end of the items, return to the first item.

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• Binding Source suspends itself when I don't want it to.

  - by Scott Chamberlain

  I have two data tables set up in a Master-Details configuration with a relation "Ticket_CallSegments" between them. I also have two Binding Sources and a Data Grid View configured like this (Init Code) // // dgvTickets // this.dgvTickets.AllowUserToAddRows = false; this.dgvTickets.AllowUserToDeleteRows = false; this.dgvTickets.AllowUserToResizeRows = false; this.dgvTickets.AutoGenerateColumns = false; this.dgvTickets.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize; this.dgvTickets.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] { this.cREATEDATEDataGridViewTextBoxColumn, this.contactFullNameDataGridViewTextBoxColumn, this.pARTIALNOTEDataGridViewTextBoxColumn}); this.dgvTickets.DataSource = this.ticketsDataSetBindingSource; this.dgvTickets.Dock = System.Windows.Forms.DockStyle.Fill; this.dgvTickets.Location = new System.Drawing.Point(0, 0); this.dgvTickets.MultiSelect = false; this.dgvTickets.Name = "dgvTickets"; this.dgvTickets.ReadOnly = true; this.dgvTickets.RowHeadersVisible = false; this.dgvTickets.SelectionMode = System.Windows.Forms.DataGridViewSelectionMode.FullRowSelect; this.dgvTickets.Size = new System.Drawing.Size(359, 600); this.dgvTickets.TabIndex = 0; // // ticketsDataSetBindingSource // this.ticketsDataSetBindingSource.DataMember = "Ticket"; this.ticketsDataSetBindingSource.DataSource = this.ticketsDataSet; this.ticketsDataSetBindingSource.CurrentChanged += new System.EventHandler(this.ticketsDataSetBindingSource_CurrentChanged); // // callSegementBindingSource // this.callSegementBindingSource.DataMember = "Ticket_CallSegments"; this.callSegementBindingSource.DataSource = this.ticketsDataSetBindingSource; this.callSegementBindingSource.Sort = "CreateDate"; //Function to update a rich text box. private void ticketsDataSetBindingSource_CurrentChanged(object sender, EventArgs e) { StringBuilder sb = new StringBuilder(); rtbTickets.Clear(); foreach (DataRowView drv in callSegementBindingSource) { TicketsDataSet.CallSegmentsRow row = (TicketsDataSet.CallSegmentsRow)drv.Row; sb.AppendLine("**********************************"); sb.AppendLine(String.Format("CreateDate: {1}, Created by: {0}", row.USERNAME, row.CREATEDATE)); sb.AppendLine("**********************************"); rtbTickets.SelectionFont = new Font("Arial", (float)11, FontStyle.Bold); rtbTickets.SelectedText = sb.ToString(); rtbTickets.SelectionFont = new Font("Arial", (float)11, FontStyle.Regular); rtbTickets.SelectedText = row.NOTES + "\n\n"; } } However when ticketsDataSetBindingSource_CurrentChanged gets called when I select a new row in my Data Grid View callSegementBindingSource.IsBindingSuspended is set to true and my text box does not update correctly (it seems to always pull from the same row in CallSegments). Can anyone see what I am doing wrong or tell me how to unsuspend the binding so it will pull the correct data?

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• How to make a UserControl with a custom DefaultBackColor?

  - by Blorgbeard

  When I right-click on my custom UserControl's BackColor property in the property-grid, then click Reset, I would like the BackColor property to change to (for example) Color.LightGreen, and the property value to appear un-bolded, to indicate that it is the default value. Currently, I know I can do this: public override void ResetBackColor() { BackColor = Color.LightGreen; } Which works as far as setting it to LightGreen on reset. But it still appears bolded in the property-grid, indicating that the current value is not the default. I notice that the Control class has a static read-only property, DefaultBackColor. Unfortunately, since it's static, I cannot override it. Is there some way to get all the functionality I want?

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• how to get all controls of win form?

  - by Shailesh

  i have a win form named A , A contains lots of different controls ,first contains a main groubbox and this groupbox countains lots of table and others group boxes. i want to find a control which has tab index 9(example) in form A but i dont know which groubox contains this control. how i found this control. regards Shailesh

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• Associating keys to buttons on a Windows Form

  - by user300484

  I have to write a method on C# that associates a certain key (from the keyboard) to a specific button. For example, if I press A, the button that I created on a form application should appear like it is being pressed.

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• Customized sorting on DataTable in C#?

  - by Steve

  This is a C# Winform question. I have a DataGridView which is bounded to a DataTable. I construct the DataTable myself, which several DataColumn instances. When the DataTable is bound to the DataGridView, by default, every column is sortable by clicking the headers of the DataGridView. But the sorting behavior is something "by default". It seems that it is sorted by string. This is true even if I put this as my code: DataColumn dc = new DataColumn("MyObjectColumn", typeof(MyObject)); And MyObject has overriden ToString() and has implemented the IComparable interface. That means even if I have told the DataTable how to sort the special column with the implementation of IComparable interface, DataGridView still doesn't do it the way I expect. So how can I let DataTable sort data in the way I want? Thanks for the answers.

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• How to edit cell of type Linkcolumn in a gridview

  - by Royson

  I have a gridview control having 4 columns. one of the column is of type linkcolumn. user has to enters data for each column. How can we edit link column cell. if i click on this cell nothing happen.i set its readonly to false also.

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• Extract wav file from video file

  - by Nikos Steiakakis

  I am developing an application in which I need to extract the audio from a video. The audio needs to be extracted in .wav format but I do not have a problem with the video format. Any format will do, as long as I can extract the audio in a wav file. Currently I am using Windows Media Player COM control in a windows form to play the videos, but any other embedded player will do as well. Any suggestions on how to do this? Thanks

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• Regex to match with digit in the string.

  - by Harikrishna

  I will have a different type of string(string will not have fixed format,they will be different every time) from them I want to remove some specific substring.Like the string can be OPTIDX 26FEB2009 NIFTY CE 2500 OPTIDX NIFTY 30 Jul 2009 4600.00 PE OPTSTK ICICIBANK 30 Jul 2009 700.00 PA I want to extract Rs.(digit) from those string and store it into one variable and then in those string there should not be Rs.(digit). What should be the regex for that ? EDIT private string ExtractingRupeesFromString(String str) { Match match = Regex.Match(cellRecord, @"(\d+(?:\.\d+)?)\D*$"); return match.Value.ToString(); }

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• Resize a ListView depending on how many items?

  - by Dodi300

  Hello. How can I resize the height of a ListView depending on how many items are in that ListView? I'm trying to get the text of an item which is clicked, however whenever the user clicks on a space which has no item, there's an error. The exact error is: InvalidArgument=Value of '0' is not valid for 'index'. Parameter name: index. I'm using the code: label14.Text = myListView1.SelectedItems[0].Text.ToString(); I figured that removing the space below the items will solve this problem. Thanks!

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• ClickOnce Deployment online questions

  - by David Archer

  Hi all, Bit of a strange question, but how do ClickOnce deployments work from a web site? I seem to be having some problems with this. Basically, the setup file will download when you click the "install" button, but then some files are missing. Do you need to be on a Microsoft server to run ClickOnce deployments? I usually do deployments over a local server with UNC, and as this is the first time I've done one online I'm struggling a bit. Any newbie tutorials you can point me to would be great, and if I do need a special host for it, could you please recommend some? Cheers!

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• Neither Invalidate() nor Refresh() invokes OnPaint()

  - by user181813

  I'm trying to get from Line #1 to Line #2 in the below code: using System; using System.Windows.Forms; namespace MyNameSpace { internal class MyTextBox : System.Windows.Forms.TextBox { protected override void OnEnabledChanged(EventArgs e) { base.OnEnabledChanged(e); Invalidate(); // Line #1 - can get here Refresh(); } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); System.Diagnostics.Debugger.Break(); // Line #2 - can't get here } } } However, it seems that neiter Invalidate() nor Refresh() causes OnPaint(PaintEventArgs e) to be invoked. Two questions: Why doesn't it work? If it can't be fixed: I only want to invoke OnPaint(PaintEventArgs e) in order to access the e.Graphics object - is there any other way to do this?

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• WinForm Text Control that displays current character/character limit

  - by Refracted Paladin

  I need a way to display, like you see in some web apps, the current characters/character limit for a Text Control(i.e. 3/500). I usually see this as a label residing directly above or below the Text Control. How is this 'normally' accomplished? Should I override my Text Control somehow? Do I just manually add labels by every Text Control and 'bind' them to properties of the Text Control? Do I need to create a composite control that has the Text Control & Label Controls together to accomplish what I need? Any direction or help will be greatly appreciated.

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• ContextMenuStrip and mouse wheel

  - by signetro

  I have a ContextMenuStrip with many items. How to handle ouse wheel to scroll throught items? I search the net but nothing find usefull. Or how to get first/last displayed/visible item from contextmenu?

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• Trying to inherit variable "text" from Form 1 for use in Form 2????

  - by JB

  I have a Form 1 as listed below, im trying to inherit the variable text from it so i can compare is value in an if statement so i can output the file specified for that id number in Form 2...is this possible??? Form 1, where variable is being used: public void button2_Click(object sender, System.EventArgs e) { timer1.Enabled = true; string text = textBox1.Text; Mainform = this; this.Hide(); } Form 2 where im trying to use the variable: if (text == "900456318") { System.Diagnostics.Process.Start("C:\\Users\\Joshua Banks\\Desktop\\Downtown_atlanta_night"); } }

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• Winform BindingSources - Question

  - by Stephen Patten

  I have a windows form (net 2.0) with controls on it bound to an entity (w/ INotifyPropertyChanged) through a BindingSource..works. On the same form I have a drop down list that is also wired up through a BindingSource..works Here's a sample of the relevant code: m_PlanItemLookupBindingSource.DataSource = GetBusinessLogic().RetrievePaymentPlanLookups(); // Collection of PaymentPlans paymentPlanType.Properties.DataSource = m_PlanItemLookupBindingSource; paymentPlanType.Properties.DisplayMember = "Name"; paymentPlanType.Properties.ValueMember = "ID"; paymentPlanType.DataBindings.Add(new Binding("EditValue", m_PlanBindingSource, "PaymentPlanID", true, DataSourceUpdateMode.OnPropertyChanged, null, "D")); agencyComission.DataBindings.Add(new Binding("EditValue", m_PlanBindingSource, "AgencyCommission", true, DataSourceUpdateMode.OnPropertyChanged, null, "P1")); billingType.DataBindings.Add(new Binding("Text", m_PlanBindingSource, "BillingType")); So when I change a value in the drop down list I thought that the m_PlanItemLookupBindingSource Current property would change along with the PaymentPlanID property of the entity which does change. Just a bit confused. Thanks in advance, Stephen

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• Operation is not valid when the DataGridView control is in virtual mode?

  - by monkey_boys

  When i add new row in datagrid that say: dataGridViewX1.Rows.Add(new string[] { "Parker", "Seattle" }); it error Operation is not valid when the DataGridView control is in virtual mode?

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• how do I get the height of a rich text content after word wrap?

  - by Led

  Question A. Given 1. A string in rich text format that may have paragraph, tabs, space, line break, indentation, (or even image?) 2. A width for the word wrapping rich text control/editor How do I know the height of the content after it have performed all the word wrapping? Is there something like int MeasureRichTextHeightAfterWordWrap(string aRichTextContent, int aWidth)? Otherwise how does those rich text control know how much to autosize? Do I have to actually place the content on a dummy rich text control and get its height afterwards? Question B. Similar to question A but in plain text onto a plain text memo/control/editor. And manually draw string with manually calculated indentations, breaks, word wrappings. Is it easier or harder?

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• Localize node texts in treeview using resource files

  - by Obalix

  For a project I need a tree view that allows the user to select a module, which then is displayed in a content area. The project relies heavily on localization and this is provided by the resource files. Now I discovered today, that the text that are assigned to preset tree view nodes are not contained in the resource files. So the question is whether there is a way of doing this, short of mapping the elemenst in code. I.e. assigning a name to the node, running over all nodes and pulling the resources from the resouce manager based on the node name. This is what I am currently doing, however, it just doesn't "feel" right: private void TranslateNodes(TreeNodeCollection treeNodeCollection) { var rm = Resources.ResourceManager; foreach (TreeNode node in treeNodeCollection) { node.Text = rm.GetString(node.Name + "_Text"); this.TranslateNodes(node.Nodes); } } Thanks!

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• Internationalize HelloWorld program .NET

  - by RockStarInTraining

  I have small test app which has 2 resource files (Resources.resx & Resources.de-DE.resx) with the same exact string names, but one has the strings converted to German. For my form I set the Localize property to ture. In my application I am getting the strings as such: this.Text = Properties.Resources.frmCaption; In my release folder I get a de-DE folder with a dll named International_test.resources.dll. I try to distribute this to a machine which is set to German and all of the strings pulled are still english. I tried keeping the International_test.resources.dll in the de-DE folder or just put in in my apps directory. What am I doing wrong or what do I need to do to get the German resource file to be used?

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• Can the Windows Media Player COM control play AVI files from memory (instead of from a file)?

  - by MusiGenesis

  I have a C# app, and I'm looking at using the Windows Media Player COM control to play animation and audio. So far, the only way I see of programatically controlling what the control is playing is to set its URL property to point to some file (I assume there's some way to pass in a playlist). Is there any way the WMP can render an AVI that is entirely in-memory, like a MemoryStream or something? If so, can WMP skip from one AVI to the next seamlessly (i.e. no glitch in either the audio or the video as it transitions from one to the next)? If WMP only plays files, is there some way to cue up a list of the files in advance of play start? If so, can WMP be made to skip from one file to the next without a brief interruption? Any knowledge or links to knowledge would be much appreciated.

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• AcceptButton for each group of controls in different tabs, Can't use some envents in Combobox to mak

  - by Muhammad Kashif Nadeem

  I have different tabs on my UserControl. Each tab has some controls and button. I want to change AcceptButton on the basis of group of controls I am in. I can use TextChanged event or Enter event to make a button AcceptButton for Textboxes but I have some Comboboxes too. These combos are auto complete so I can't user Enter event on these, because on Enter these combos should be completed. Following image can explain my problem more. Thanks.

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• How to Retrive data from XML Using XMLReader in C#

  - by Suryakavitha

  Hi, I am using windows application and i have four combo boxes(comboeventname,combosendtype,comboType,comboschedule) in that form.... I have stored that combo values in to XML file by using XML writer... now i want to display tha datas in that combo boxes in form load event when form opns in run time... How to retrive that values from that XML file and how to display that datas in combo boxes while run time... How shall i do this? Anyone tell me the solution of this..... Thanks in Advance...

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