fatal error encountered during command execution during update

Question

i use this code to update data that are in the textboxes... this code is in the update button and once i made the changes and clicked the button the error message appears

        try
        {
            MySqlConnection connection = new MySqlConnection(MyConnectionString);
            MySqlCommand cmd;
            connection.Open();
            cmd = connection.CreateCommand();
            cmd.CommandText = "UPDATE student_info SET SEM = @SEM, STUDENT_NO = @STUDENT_NO, LASTNAME = @LASTNAME" +
            ", FIRSTNAME = @FIRSTNAME, MIDDLENAME = @MIDDLENAME, CITY = @CITY, STREET = @STREET, GENDER = @GENDER" +
            ", COURSE = @COURSE, YEAR = @YEAR, SECTION = @SECTION, BIRTHDAY = @BIRTHDAY  Where STUDENT_NO = @STUDENT_NO";

            cmd.Parameters.AddWithValue("@SEM", sem_combo.Text);
            cmd.Parameters.AddWithValue("@STUDENT_NO", studentNo_txt.Text);
            cmd.Parameters.AddWithValue("@LASTNAME", lname_txt.Text);
            cmd.Parameters.AddWithValue("@FIRSTNAME", fname_txt.Text);
            cmd.Parameters.AddWithValue("@MIDDLENAME", mname_txt.Text);
            cmd.Parameters.AddWithValue("@CITY", address_txt.Text);
            cmd.Parameters.AddWithValue("@STREET", street_txt.Text);
            cmd.Parameters.AddWithValue("@GENDER", gender_combo.Text);
            cmd.Parameters.AddWithValue("@COURSE", program_combo.Text);
            cmd.Parameters.AddWithValue("@YEAR", yr_combo.Text);
            cmd.Parameters.AddWithValue("@SECTION", section_combo.Text);
            cmd.Parameters.AddWithValue("@BIRTHDAY", bday.Text);
            cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();

            cmd.CommandText = "UPDATE contacts SET EMAIL = @EMAIL, CELL_NO = @CELL_NO Where STUDENT_NO = @STUDENT_NO";

            cmd.Parameters.AddWithValue("@EMAIL", email_txt.Text);
            cmd.Parameters.AddWithValue("@CELL_NO", contact_txt.Text);
            cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

the error message is fatal error encountered during command execution — davz_11, Mar 12 '14 at 12:54

score 2 · Accepted Answer · answered Mar 12 '14 at 12:53

Check in This Line

            cmd.Parameters.Clear();

            cmd.CommandText = "UPDATE contacts SET EMAIL = @EMAIL,
            CELL_NO = @CELL_NO Where STUDENT_NO = @STUDENT_NO";

            cmd.Parameters.AddWithValue("@EMAIL", email_txt.Text);
            cmd.Parameters.AddWithValue("@CELL_NO", contact_txt.Text);
            cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();

Change To

            cmd.Parameters.Clear();
            cmd.CommandText = "UPDATE contacts SET EMAIL = @EMAIL,
            CELL_NO = @CELL_NO Where STUDENT_NO = @STUDENT_NO";

            cmd.Parameters.AddWithValue("@EMAIL", email_txt.Text);
            cmd.Parameters.AddWithValue("@CELL_NO", contact_txt.Text);
            cmd.Parameters.AddWithValue("@STUDENT_NOL",studentNo_txt.Text);
            cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();

you are clear the parameters, but after that use @STUDENT_NO parameter. This parameter is not declare any where after clear ther parameters

Thanks, helped me find my error! It should have been obvious, but when you're panicking, it's easy to overlook small stuff. — Sean Kendle, Feb 18 '15 at 17:25

fatal error encountered during command execution during update

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