Thanks, and i got the solution using user32.dll like
[CODE=cpp]
'Decleration part
#region Remove from Alt Tab
[DllImport("user 32.dll")]
public static extern int SetWindowLong(I ntPtr window, int index, int value);
[DllImport("user 32.dll")]
public static extern int GetWindowLong(I ntPtr window, int index);
const int GWL_EXSTYLE = -20;
const int WS_EX_TOOLWINDO W = 0x00000080;
const int WS_EX_APPWINDOW = 0x00040000;
#endregion[/CODE]
calling after InitializeCompo nent, or form load events
[CODE=cpp]
int windowStyle = GetWindowLong(t his.Handle, GWL_EXSTYLE);
SetWindowLong(t his.Handle, GWL_EXSTYLE, windowStyle | TOOLWINDOW);[/CODE]
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