private void DTPFromDate_KeyDown(object sender, KeyEventArgs e)
 {
     if (e.KeyCode == Keys.Enter)
     {
         DTPToDate.Focus();
         e.Handled = true;
     }
 }
 private void DTPFromDate_KeyDown(object sender, KeyEventArgs e)
 {
     if (e.KeyCode == Keys.Enter)
     {
         if (DTPFromDate.Value != null)
         {
             DTPToDate.Focus();
             e.Handled = true;
         }
         else
         {
             MessageBox.Show("Fill the 'From Date' to continue...!", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
         }
     }
 }