ArcGISCompare.dlgConstant.forNulls_TextChanged C# (CSharp) Метод

        void forNulls_TextChanged(object sender, EventArgs e)
        {
            if (forNulls.Text == "F") { chkNulls.Visible = false; }
              else
              {
            chkNulls.Checked = true;
            chkNulls.Visible = true;
              }
        }