using System . Runtime . InteropServices;
[ DllImport ( "shell32.dll" , EntryPoint = "#61" )]
private static extern int SHRunDialog( IntPtr hOwner, int Unknown1, int Unknown2,
string szTitle, string szPrompt, int uFlags);
private void button1_Click( object sender , EventArgs e)
{
SHRundialog(Handle, 0 , 0 , null , null , 2 );
}