کد اتصال به بانک اطلاعاتی و حذف یک رکورد از جدول در C#

try
            {
              
                SqlConnection objConnectionup = new SqlConnection("Server=" + System.Net.Dns.GetHostName() + ";Database=نام بانک;Integrated Security=true");
                SqlCommand objCommandup = new SqlCommand();
                objConnectionup.Open();
                objCommandup.Connection = objConnectionup;
                objCommandup.CommandText = "delete from نام جدول where فیلد کلید='" + تکس بوکس + "'";

                objCommandup.ExecuteNonQuery();
                objConnectionup.Close();
                            }
            catch (Exception qww)
            {

                MessageBox.Show(qww.Message);

            }