private void إضافةالصفيحالمقصوصالمورنشToolStripMenuItem_Click(object sender, EventArgs e)
 {
     using (addnewcutmuranmaterial myform = new addnewcutmuranmaterial())
     {
         myform.ShowDialog();
     }
 }
 private void new_btn_Click(object sender, EventArgs e)
 {
     this.Hide();
     using (addnewcutmuranmaterial myform = new addnewcutmuranmaterial())
     {
         myform.ShowDialog();
     }
     this.Close();
 }