Insert information from mysql to a textbox

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C#

I'm trying to show information from mysql into a textbox (DescriptionTxtbx), however its not working correctly, sometimes displaying the wrong information depending what i click on ..

private void CarryOrderBtn_Click(object sender, EventArgs e)
{
SqlCommand Cmd = sqlcon.CreateCommand();
Cmd.CommandText = "select [Product Description] from CustomerOrders";
sqlcon.Open();
//fill in the textbox you want.
mainForm.DescriptionTxtbx.Text = Cmd.ExecuteScalar().ToString();
sqlcon.Close();

mainForm.ShowDialog();
}

What I have tried:

changing the code entirely, checking code