mysql database update from textboxes values not working

MySqlCommand sqlcom = new MySqlCommand("UPDATE t_company SET Company_Name=@Company_Name,Description=@Description,Email=@Email where Company_Name=@Company_Name'" + "'", mycon1);
sqlcom.Parameters.Add("@Company_Name", MySqlDbType.VarChar, 100).Value = txtCompany_Name.Text;
               sqlcom.Parameters.Add("@Description", MySqlDbType.VarChar, 100).Value = txtDescriptionNumber.Text;
               sqlcom.Parameters.Add("@Email", MySqlDbType.VarChar, 100).Value = txtEmailText;

sqlcom.Connection = mycon1;
               sqlcom.ExecuteNonQuery();
               mycon1.Close();