C#

using System;<br />
using System.Runtime.InteropServices;<br />
using System.Windows.Forms;<br />
using System.Diagnostics;<br />
using System.Reflection;<br />
<br />
 public class OneInstnace<br />
 { <br />
 [STAThread]<br />
 public static void Main()<br />
 {<br />
 //Get the running instance.<br />
 Process instance = RunningInstance();<br />
 if (instance == null)<br />
 {<br />
 //There isn't another instance, show our form.<br />
 Application.Run (new Form());<br />
 }<br />
 else<br />
 {<br />
 //There is another instance of this process.<br />
 HandleRunningInstance(instance);<br />
 }<br />
 }<br />
 public static Process RunningInstance()<br />
 {<br />
 Process current = Process.GetCurrentProcess();<br />
 Process[] processes = Process.GetProcessesByName (current.ProcessName);<br />
<br />
 //Loop through the running processes in with the same name<br />
 foreach (Process process in processes)<br />
 {<br />
 //Ignore the current process<br />
 if (process.Id != current.Id)<br />
 {<br />
 //Make sure that the process is running from the exe file.<br />
 if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") ==<br />
 current.MainModule.FileName)<br />
 {<br />
 //Return the other process instance.<br />
 return process;<br />
 }<br />
 }<br />
 }<br />
<br />
 //No other instance was found, return null.<br />
 return null;<br />
 }<br />
<br />
<br />
 public static void HandleRunningInstance(Process instance)<br />
 {<br />
 //Make sure the window is not minimized or maximized<br />
 ShowWindowAsync (instance.MainWindowHandle , WS_SHOWNORMAL);<br />
<br />
 //Set the real intance to foreground window<br />
 SetForegroundWindow (instance.MainWindowHandle);<br />
 }<br />
<br />
 [DllImport("User32.dll")] <br />
<br />
private static extern bool ShowWindowAsync(<br />
 IntPtr hWnd, int cmdShow);<br />
 [DllImport("User32.dll")] private static extern bool<br />
 SetForegroundWindow(IntPtr hWnd);<br />
 private const int WS_SHOWNORMAL = 1;<br />
 }<br />
<br />

For_IT wrote:

Can anyone suggest me whats going wrong here

private void button1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
	if(e.Button == MouseButtons.Left && e.Clicks == 2)
	{
		MessageBox.Show("I was a double left button click");
	}
}

dr["id"] = assignID();
dr["User"] = User;
dr["Category"] = Category;
dr["Description"] = Description;

DataRow Child = d.Tables["Call"].NewRow();<br />
Child["id"] = assignID();<br />
Child["User"] = User;<br />
Child["CallCategory"] = Category;<br />
Child["Description"] = Description;<br />
Child.SetParentRow(d.Tables["ServiceRequest"].Rows[0]);<br />
d.Tables["Call"].Rows.Add(Child);<br />
d.WriteXml(Server.MapPath("ServiceDeskData.xml"));

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