C#

Managed Debugging Assistant 'LoaderLock' has detected a problem in 'D:\Dev\throwaway\pinvoke\pinvoke\bin\Debug\pinvoke.exe'.<br />
Additional Information: Attempting managed execution inside OS Loader lock. Do not attempt to run managed code inside a DllMain or image initialization function since doing so can cause the application to hang.[/code]<br />
<br />
Here is what my DllMain looks like, but again why isn't this happening with my release version?<br />
<br />
<code><br />
BOOL APIENTRY DllMain( HMODULE hModule,<br />
                       DWORD  ul_reason_for_call,<br />
                       LPVOID lpReserved<br />
					 )<br />
{<br />
	switch (ul_reason_for_call)<br />
	{<br />
	case DLL_PROCESS_ATTACH:<br />
	case DLL_THREAD_ATTACH:<br />
	case DLL_THREAD_DETACH:<br />
	case DLL_PROCESS_DETACH:<br />
		break;<br />
	}<br />
    return TRUE;<br />
}

[System.Runtime.InteropServices.StructLayout(LayoutKind.Sequential)]
struct HDR
{
   int hdr_size; // keep in mind, a C++ long is a 32 bit integer, which C# calls int. C#'s long is a 64 bit integer
   string hdr_data; // Not really sure what's the best way here: some people use ushort*, others use string or even StringBuilder. Depends on what you're doing with hdr_data, and whether it needs to be returned to managed code.
}

using System.Windows.Forms;
using System.ComponentModel;

class MyForm : Form
{
   private bool stopUserFromClosingForm = true;

   public MyForm()
   {     
   }

   protected override void OnClosing(CancelEventArgs e)
   {
      if(stopUserFromClosingForm)
      {
           e.Cancel = true;
      }
   }
}

static void Run()
{
   Form myForm = new Form()
   myForm.Closing += new CancelEventHandler(this.HandleFormClose);
   myForm.Show()
}

private void HandleFormClose(object sender, CancelEventArgs e)
{
   e.Cancel = true; // stop the form closing
}

<br />
(under Tabs)<br />
private void searchClick(object sender, System.EventArgs e)<br />
{<br />
Searching s = new Searching();<br />
s.ShowDialog();<br />
MessageBox.Show(s.searchThis);<br />
s.Dispose();<br />
}<br />

private void searchClick(object sender, System.EventArgs e)
{
  using (Searching s = new Searching())
  {
    if (s.ShowDialog(this) == DialogResult.OK)
      MessageBox.Show(s.SearchThis);
  }
}

public string SearchThis;
 
private void goClick(object sender, System.EventArgs e)
{
  SearchThis = "cust";
  DialogResult = DialogResult.OK;
  Close();
}

public class PictureSelectionBox : PictureBox
{
   private Rectangle selectionRect;
   private Pen selectionPen;

   public Rectangle CurrentSelection
   { 
      get { return this.selectionRect; }
      set
      {
         this.selectionRect = value;
         this.Refresh();
      }
   }

   public Pen SelectionPen
   {
      get { return this.selectionPen; }
      set
      {
          this.selectionPen = value;
          this.Refresh();
      }
   }

   protected override void OnPaint(PaintEventArgs e)
   {
     base.OnPaint(e);

     if (this.selectionPen != null &&
         this.selectionRect.Width != 0 &&
         this.selectionRect.Height != 0)
     {
         e.Graphics.DrawRectangle(this.selectionPen, this.selectionRect);
     }
   }

   public void CommitSelection()
   {
     Graphics g = Graphics.FromImage(base.Image);
     g.DrawRectangle(this.selectionPen, this.selectionRect);
     g.Dispose();

     this.CurrentSelection = new Rectangle(0, 0, 0, 0);
     this.Refresh();
   }
}

Graphics g = this.CreateGraphics();
OnPaint(new PaintEventArgs(g, this.ClientRectangle));
g.Dispose();