private void frmMain_Load(object sender, EventArgs e)
{
Application.ExitThread();
frmCsarresid f2 = new frmCsarresid(); f2.ShowDialog();
i comment a row: The problem was solved
private void frmMain_Load(object sender, EventArgs e)
{
Application.ExitThread();
//frmCsarresid f2 = new frmCsarresid(); f2.ShowDialog();</pre>