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The symptoms you mentioned usually occur in applications when it is too tight on memory, typically caused by memory leaks. Check if the control has any known issues and if it is supported on all platforms.
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Hi Shameel,
thanks for the tip. It really seems to be a memory leak. But it has nothing to do with the folder browser dialog. The leak probably occurrs in another referenced dll.
Best Regards,
Viola
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i want to drag a control and drop it on some other position in the same form window. can any body please help me on that.
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Hint: Use the MouseDown, MouseMove and MouseUp events and change the Location property of the control.
modified on Tuesday, November 17, 2009 10:36 AM
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I wrote something like this back in the day and I will look for it. But dragging controls is very demanding since they redraw all the time causing flickering and bad performance (at least in .net 2.0).You can show squares when you drag or implement it by adding custom redraw on bitmaps which may still cause problems, very complicates and has relatively poor performance.
This is a big task and you should be looking for a nice peace of code to start with.Try looking for a custom drawn object source code it will be a good start.
I don't know whether you should use an off the shelf product, check quality and pricing first.
I found this here : Drag and Drop Image C#
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I am using Visual C# Express 2008 SP1 on Windows Vista will all the updates applied. No matter what I try, I can't open some inherited forms (if I am even using that term correctly) in the Forms Designer. But my project builds just fine! I am going nuts not being able to design my forms. I am having trouble because I re-did my project's namespaces and maybe the designer is getting confused.
The form I want to open is in the 'Windows' namespace (something I made up, i.e. MyProject.Gui.Windows) and the baseform and its base are in the 'Docking' namespace as in MyProject.Gui.Docking and I think it is because my namespaces must somehow be retarded is why I am getting the error:
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager manager)
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad(IDesignerLoaderHost host)
I am also doubly confused becuase my code builds just fine. My code is as follows:
baseform of the baseform:
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics.CodeAnalysis;
using System.Diagnostics;
namespace MyProject.Gui.Docking
{
public class DockContent : Form, IDockContext
{
public DockContent()
{
InitializeComponent();
}
}
}
The baseform of the baseform (above) has no .designer.cs file. It is part of the WeifenLuo.Docking library. I subsumed the library directly into my project's namespace structure so I don't have to lug around DLL's. I can view this baseform of the baseform in the designer just fine.
Now on to its first-level derived form ToolWindow.
i.e., the code is
using System;
using MyProject.Gui.Docking;
using MyProject.Core;
namespace MyProject.Gui.Windows
{
public partial class ToolWindow : DockContent
{
public ToolWindow()
{
InitializeComponent();
}
...
}
}
Notice how I derive from DockContent class which is in the Docking namespace but my child form is in the Windows namespace. I tried putting the child class also in the same namespace but the child form still would not design.
But changing the namespaces doesn't do anything! Even if all the forms in the hierarchy are still in the same namespace the Forms Designer still craps on me. I suspect I am being completely retarded about something but I can't figure out what. Any help would be appreciated.
Sincerely Yours,
Brian Hart
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Hello,
I'm working on Windows application c#
i have form1 which contain data gridview to view the content of table from sql database.
i've enabled edit, delete in the gridview, and then i've added two queries one for update and the other for delete through MyDataSet1.xsd page.
now after updating and/or deleting any record i wanna click on a button to confirm user that the operation done. but i don't know how to save updating or deleting!!
any help guys?
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1. Handle the UserDeletingRow event
2. Query the user if he/she wants to delete the row
3. Set the DataGridViewRowCancelEventArgs.Cancel = true, based on the response.
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Hi,
I have a little problem with CheckedListBox control. Is there any way to disable checking control items on keyboard key press? I want to disable checking when alphabetical and numerical signs are pressed. Sorry for my bad english.
Peter.
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Handle the KeyDown event and set KeyEventArgs.Handled = true
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In my Windows Forms application I have a listbox on the form. This is a multiple selection list box.
I can use SelectedIndices property to get the indices of all the selected items.
However, given an index number, is there a simple way to tell if the item is selected or not? Right now I search the SelectedIndices to see if the index is there. I wonder if there is a method call to tell me directly if an item is selected or not. I tried to find that but couldn't.
Thanks!
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Hi,
you could try listBox.Items.Contains(...)
Luc Pattyn
I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages
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it should be listBox.SelectedIndices.Contains(...)
listBox.Items.Contains(...) will be true for all items.
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Hello,
I am using propertyGrid window to display name and its value. I allow the user to enter value and if he enters a wrong value (there is a seperate code to validate), then I am supposed to display the user entered text value in red color (text in red color) or the back ground color of that particular cell alone (not the entire propertyGrid window) in red color. Is this posssible using PropertyGrid?
I can understand that the color of entire propertyGrid can be changed, but I am looking for changing single cell's either the text color or the background color of the particular cell to red.
Thanks in advance
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The ProeprtyGrid cannot change the color of individual cells. How each cell is rendered, including color, is left up to the UITypeEditor for each property. You'd have to create a new UITypeEditor for each of the properties that you want to be able to render in a different color.
Documentation on User Interface Type Editors[^].
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I tried using UITypeEditor which allows me to paint the cell, but it also displays a small recangular box in the cell, which makes my display look ugly. Can you tell me how to get rid of this small rectangle?
The rectangular box appears as soon as I override the following function of UIEditorType
public override bool GetPaintValueSupported(ITypeDescriptorContext context)
{
//Set to true to implement the PaintValue method
return true;
}
I tried clearing the cell in PaintValue method but that did not work
public override void PaintValue(PaintValueEventArgs e)
{
base.PaintValue(e);
Region reg = new Region(new Rectangle(e.Bounds.X , e.Bounds.Y, e.Bounds.Width+10 , e.Bounds.Height));
Region tempReg = e.Graphics.Clip;
e.Graphics.Clip = reg;
// Tried to clear the entire cell with white color but still the small rectangle appears
e.Graphics.Clear(Color.White);
e.Graphics.Clip = tempReg;
// Fill region also did not work
//e.Graphics.FillRegion(Brushes.Red, reg);
}
}
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Since I can't see the "small rectangle" you're talking about, no I can't tell you how to get rid of it.
Perhaps a screen shot would help??
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I m trying to click mouse automatically using code in some specific location for this i m using following code but its not working
[System.Runtime.InteropServices.DllImport("user32.dll")]
public static extern void mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);
public const int MOUSEEVENTF_LEFTDOWN = 0x02;
public const int MOUSEEVENTF_LEFTUP = 0x04;
public const int MOUSEEVENTF_RIGHTDOWN = 0x08;
public const int MOUSEEVENTF_RIGHTUP = 0x10;
public void MouseClick()
{
int x = 100;
int y = 100;
mouse_event(MOUSEEVENTF_LEFTDOWN, x, y, 0, 0);
mouse_event(MOUSEEVENTF_LEFTUP, x, y, 0, 0);
}
Plz Help me
To move cursor i m using Cursor.Position = new Point((int)10, (int)10); thats working fine
Plz help
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shaina2231 wrote: OK the Problem IS SOlved
And how exactly did you solve the problem?
I'm interested because I'm working on same thing.
Lukas
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Hi,
I'm using the following user32 functions:
- SetCursorPos() to move the mouse
- SendInput() to give a MOUSEEVENTF_LEFTDOWN and MOUSEEVENTF_LEFTUP
IIRC the x,y parameters of mouse_event describe a relative mouse movement, so I keep them at zero.
Here are my P/Invoke prototypes:
[DllImport("user32.dll", CallingConvention=CallingConvention.StdCall, SetLastError=true)]
public static extern IntPtr SendInput(int count, ref INPUT2 input, int size);
[DllImport("user32.dll", CallingConvention = CallingConvention.StdCall, SetLastError = true)]
public static extern IntPtr SetCursorPos(int x, int y);
public struct MOUSEINPUT {
public int dx;
public int dy;
public int mouseData;
public int dwFlags;
public int time;
public IntPtr dwExtraInfo;
}
public struct INPUT2 {
public uint type1;
public MOUSEINPUT mi1;
public uint type2;
public MOUSEINPUT mi2;
}
Luc Pattyn
I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages
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Hi,
Kindly help me, i took textbox from one of my other project into my current project but whenevr i click on Form Design its showing me this errors:
The variable TextBox1 is either undeclared or was never assigned
Plzzz help me...
Thank you
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