private void BtnColor_Click(object sender, EventArgs e)
{
if (DlgColor.ShowDialog() == DialogResult.OK)
{
TxtColor.Text = Operation_Kart.ConvertHex(DlgColor.Color.R.ToString()) + Operation_Kart.ConvertHex(DlgColor.Color.G.ToString()) + Operation_Kart.ConvertHex(DlgColor.Color.B.ToString());
}
}