private void button3_Click(object sender, EventArgs e)
{
    if (this.gridView1.RowCount > 0)
    {
        if (this.saveFileDialog1.ShowDialog() == DialogResult.OK)
        {
             gridColumn1.Visible = false;
             try
             {
                 this.gridControl1.ExportToXls(this.saveFileDialog1.FileName);
             }
             catch (Exception ex)
             {
                  MessageBox.Show(ex.Message);
             }
             gridColumn1.Visible = true;
        }
    }
}