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Trouble Updating Data

Posted on 2011-09-28
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Last Modified: 2012-05-12
Hell Experts,

I have the following code below. I tested all Stored Procedures and they all execute fine. Just trouble with the code (I believe it has something to do with PostBack(s).

What happens is that every time I try to fire the onclick="btnUpdateCourseDescription_Click" code the page refreshes itself and post the data that I try to edit back to it's original copy.


protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            RetrieveCoursesValues();
        }
        RetrieveCoursesDesc();
    }

    protected void RetrieveCoursesValues()
    {
            using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["HealthCourses"].ConnectionString))
            {
                SqlCommand cmd = new SqlCommand();
                cmd.CommandText = "HealthCourses_RetrieveCoursesValues";
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Connection = conn;

                DataTable dtCoursesValues = new DataTable();
                SqlDataAdapter adp = new SqlDataAdapter();

                try
                {
                    conn.Open();

                    adp.SelectCommand = cmd;
                    adp.Fill(dtCoursesValues);

                    ddlCourseUpdate.DataSource = dtCoursesValues;
                    ddlCourseUpdate.DataValueField = "ghaoc_id";
                    ddlCourseUpdate.DataTextField = "ghaco_name";
                    ddlCourseUpdate.DataBind();
                }

                catch (Exception ex)
                {
                    ex.Message.ToString();
                }

                finally
                {
                    conn.Close();
                }
            }
    }

    protected void RetrieveCoursesDesc()
    {
            using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["HealthCourses"].ConnectionString))
            {
                SqlCommand cmd = new SqlCommand();
                cmd.CommandText = "HealthCourses_RetrieveCoursesDescByID";
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Connection = conn;

                cmd.Parameters.AddWithValue("@ghaoc_id", SqlDbType.Int).Value = ddlCourseUpdate.SelectedValue;

                DataTable dtCoursesDesc = new DataTable();
                SqlDataAdapter adp = new SqlDataAdapter();

                try
                {
                    conn.Open();

                    adp.SelectCommand = cmd;
                    adp.Fill(dtCoursesDesc);

                    if ((dtCoursesDesc != null))
                    {
                        DataRow data = dtCoursesDesc.Rows[0];
                        TextBox1.Text = data["ghaco_desc"].ToString();
                    }
                }

                catch (Exception ex)
                {
                    ex.Message.ToString();
                }

                finally
                {
                    conn.Close();
                }
            }
    }

    protected void btnUpdateCourseDescription_Click(object sender, EventArgs e)
    {
            using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["HealthCourses"].ConnectionString))
            {
                SqlCommand cmd = new SqlCommand();
                cmd.CommandText = "HealthCourses_UpdateGeneralHealthAwarenessOneCourses";
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Connection = conn;

                cmd.Parameters.AddWithValue("@ghaoc_id", SqlDbType.Int).Value = hf_ghaoc_id.Value;
                cmd.Parameters.AddWithValue("@ghaco_desc", SqlDbType.VarChar).Value = TextBox1.Text;

                try
                {
                    conn.Open();

                    cmd.ExecuteNonQuery();

                    Server.Transfer("courses_update_success.aspx");
                }

                catch (Exception ex)
                {
                    ex.Message.ToString();
                }

                finally
                {
                    conn.Close();
                }
            }
    }
0
Comment
Question by:asp_net2
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6 Comments
 
LVL 17

Expert Comment

by:sonawanekiran
ID: 36716704
Why your are doing like this

 Server.Transfer("courses_update_success.aspx");

Instead call below method

RetrieveCoursesDesc();

OR

RetrieveCoursesValues();
0
 
LVL 4

Author Comment

by:asp_net2
ID: 36716717
Hi sonawanekiran,

Not sure what you mean. Server.Transfer("courses_update_success.aspx"); is used to send user to a Success page letting them know that they updated the data fine. I don't even see that page though.
0
 
LVL 4

Author Comment

by:asp_net2
ID: 36716733
Also, I just put a breakpoint on line below and noticed the value was "". Could this be why it cannot update? If so, how can I fix that?

cmd.Parameters.AddWithValue("@ghaoc_id", SqlDbType.Int).Value = hf_ghaoc_id.Value;
0
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LVL 17

Accepted Solution

by:
sonawanekiran earned 2000 total points
ID: 36716765
I guess hf_ghaoc_id is a hidden field and and value is not set to hidden field during page load or something.
Check why not value is assigned to hidden field hf_ghaoc_id
0
 
LVL 4

Author Comment

by:asp_net2
ID: 36716816
Yes hf_ghaoc_id is a hidden field.

>> Check why not value is assigned to hidden field hf_ghaoc_id
I'm not sure why it's not set. Can you assist me in setting that value to page_load? That may be the problem because the Update is depending on that value ghaoc_id.
0
 
LVL 4

Author Closing Comment

by:asp_net2
ID: 36718733
I figured it out using a different method.
0

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