Control of button is dialogbox

private void SaveButton_Click(object sender, EventArgs e)

{

    SaveFileDialog saveFileDialog1 = new SaveFileDialog();     

    saveFileDialog1.InitialDirectory = @"C:\";

    saveFileDialog1.Title = "Save text Files";

    saveFileDialog1.CheckFileExists = true;

    saveFileDialog1.CheckPathExists = true;

    saveFileDialog1.DefaultExt = "txt";

    saveFileDialog1.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";

    saveFileDialog1.FilterIndex = 2;

    saveFileDialog1.RestoreDirectory = true;     

    if (saveFileDialog1.ShowDialog() == DialogResult.OK)

    {

       textBox1.Text = saveFileDialog1.FileName;           

    }

}