Re: Force a PostBack? Page will not repopulate after first Click - ASP.NET Discussion Boards

These looks like a Telerik grid control related issue. Telerik offers forum for helping out developers who have been using their product. You might get a quick work around if you post this query in telerik forum. Try here [http://www.telerik.com/automated-testing-tools/community/forums/aspnet-ajax/grid/accessing-value-in-onitemdatabound-item-in-insert-mode-does-implement-indexer-only-when-the-edit-form-is-autogenerated.aspx]

Thanks,
Arindam D Tewary

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modified on Monday, May 3, 2010 6:22 PM

Hello,

I have written a page that accepts new information and then repopulates the page when a button is clicked. This is a simple task in C#, but seems very complicated in ASP.net. The code seems to work fine on the first click, but the after the first click, the page no longer repopulates. Closer examination reveals that although the values are changed on the page, the actual values held in memory remain the same; ergo, new results are the same as the old. Now...I see that on some controls (such as RadioButton) there is an automatic postback feature, however, I cannot find this for a button. Of course, I am presuming that the Postback is the problem....OR... perhaps it's something else? My preference is not to use javascript, but I of course will if that is the only way. I am still amazed that (after all this time) ASP still has to rely on Javascript for certain features. Any ideas both welcomed and appreciated.

Thank You, Pat

Show us your Page_Load function.

Dave,

Thank you for your reply. I have pasted the Page_Load info below. This page is brought up from a click event on another page's GridView and is supposed to populate information accordingly.

protected void Page_Load(object sender, EventArgs e)
    {
        medDate = CreateMedicalDate(medDate);

        //Load the results for the requested AE

        //Pass the values for the selected AE from the AE Summary Page
        id = Request.QueryString["Id"];
        Screening_Number = Request.QueryString["Screening_Number"];
        Site_Number = Request.QueryString["Site_Number"];
        Version_Id = Request.QueryString["Version_Id"];
        Version = Request.QueryString["Version"];
        AE = Request.QueryString["Ae"];
        Serious = Request.QueryString["Serious"];

        GetLastVersion();

        //Create a new SQL Connection Object
        SqlConnection Conn = new SqlConnection(CONNSTR);

        try
        {
            string Sql = "SELECT [Id],[Period] , [Screening_Number] , [Site_Number] , " +
            "[Version_Id],[Version] , [Ae] , [Frequency] , [Visit] , [VisitNumber] , [Date_Onset] , " +
            "[Ongoing] , [Date_Ended] , [CTCAE] , [Serious] , [Related] , [Action] , [Outcome] , " +
            "[NewConMedsY], [NewConMedsN], [SubBy] , [SubOn] , [Sae_Rpt_Status] " +
            "FROM Adverse_Events WHERE [Version_Id] = @Version_Id AND [Version] = @LastVersion ";

            //Set Command Object Headers
            SqlCommand Comm = new SqlCommand(Sql, Conn);
            Comm.CommandType = CommandType.Text;

            //Comm Paramemters
            Comm.Parameters.Clear();
            Comm.Parameters.AddWithValue("@Version_Id", Version_Id);
            Comm.Parameters.AddWithValue("@LastVersion", lastCompletedVersion);

             //Create a Dataset
            SqlDataAdapter da = new SqlDataAdapter(Comm);
            DataSet ds = new DataSet();
            da.Fill(ds);

            //Send results to the controls 
            LabelPeriod.Text = ds.Tables[0].Rows[0]["Period"].ToString();
            LabelScreeningNumber.Text  = ds.Tables[0].Rows[0]["Screening_Number"].ToString();
            LabelVersion.Text = ds.Tables[0].Rows[0]["Version"].ToString();
            LabelId.Text = ds.Tables[0].Rows[0]["Id"].ToString();
            LabelAe.Text = ds.Tables[0].Rows[0]["Ae"].ToString();
            LabelFrequency.Text = ds.Tables[0].Rows[0]["Frequency"].ToString();
            LabelVisit.Text = ds.Tables[0].Rows[0]["Visit"].ToString();
            LabelVisitNum.Text = ds.Tables[0].Rows[0]["VisitNumber"].ToString();
            LabelDateStarted.Text = ds.Tables[0].Rows[0]["Date_Onset"].ToString();
            LabelOngoing.Text = ds.Tables[0].Rows[0]["Ongoing"].ToString();
            LabelDateStopped.Text = ds.Tables[0].Rows[0]["Date_Ended"].ToString();
            LabelCtcae.Text = ds.Tables[0].Rows[0]["CTCAE"].ToString();
            LabelSerious.Text = ds.Tables[0].Rows[0]["Serious"].ToString();
            LabelRelated.Text = ds.Tables[0].Rows[0]["Related"].ToString();
            LabelAction.Text = ds.Tables[0].Rows[0]["Action"].ToString();
            LabelOutcome.Text = ds.Tables[0].Rows[0]["Outcome"].ToString();
            RadioButtonConMedY.Checked = Convert.ToBoolean(ds.Tables[0].Rows[0]["NewConMedsY"].ToString());
            RadioButtonConMedN.Checked = Convert.ToBoolean(ds.Tables[0].Rows[0]["NewConMedsN"].ToString());
            LabelSubBy.Text = Session["Name"].ToString();
            LabelSubOn.Text = medDate;          
            
        }
        catch (Exception ex)  //Catch Errors
        {
            Console.WriteLine("Error : " + ex.Message);
        }

        SetDateDropdownBoxes();

    }

There is a button on the page that is supposed to decrement a value in the LabelVersion label and re run the Sql thereby re populating the page with new information. As I said, it works on the first click, but not afterwards. Thanks for your attention. Best, Pat

And where is the button click event? Without checking for IsPostback all this will do is repopulate the controls from the database and overwrite the value you expect.

I would refactor this code to extract the all the SQL lookup code to a method so It can be called from multiple places in your code. Such as from the PageLoad event and from the button click handler

I know the language. I've read a book. - _Madmatt

Thank you for your help, Mark. Here is the full text:

//The Button Code

protected void ButtonGoBack_Click(object sender, EventArgs e)
{
    LoadPreviousVersion();
}

//The Method Call

private void LoadPreviousVersion()
   {
       //Get requested version and test result
       int requestedVersion = (int.Parse(LabelVersion.Text)) - 1;
       if (requestedVersion < 1)
           requestedVersion = 1;

       //Set Label for new version
       LabelVersion.Text = requestedVersion.ToString();

       //Determine Edit Button availability
       if (int.Parse(LabelVersion.Text) != int.Parse(lastCompletedVersion))
           ButtonEdit.Enabled = false;
       else
           ButtonEdit.Enabled = true;

       //Create Medical Date
       medDate = CreateMedicalDate(medDate);

       //Load the results for the requested AE

       //Create a new SQL Connection Object
       SqlConnection Conn = new SqlConnection(CONNSTR);

       try
       {
           string Sql = "SELECT [Id],[Period] , [Screening_Number] , [Site_Number] , " +
           "[Version_Id],[Version] , [Ae] , [Frequency] , [Visit] , [VisitNumber] , [Date_Onset] , " +
           "[Ongoing] , [Date_Ended] , [CTCAE] , [Serious] , [Related] , [Action] , [Outcome] , " +
           "[NewConMedsY], [NewConMedsN], [SubBy] , [SubOn] , [Sae_Rpt_Status] " +
           "FROM Adverse_Events WHERE [Version_Id] = @Version_Id AND [Version] = @RequestedVersion ";

           //Set Command Object Headers
           SqlCommand Comm = new SqlCommand(Sql, Conn);
           Comm.CommandType = CommandType.Text;

           //Comm Paramemters
           Comm.Parameters.Clear();
           Comm.Parameters.AddWithValue("@Version_Id", Version_Id);
           Comm.Parameters.AddWithValue("@RequestedVersion", requestedVersion);

           //Create a Dataset
           SqlDataAdapter da = new SqlDataAdapter(Comm);
           DataSet ds = new DataSet();
           da.Fill(ds);

           //Send results to the controls
           LabelPeriod.Text = ds.Tables[0].Rows[0]["Period"].ToString();
           LabelScreeningNumber.Text = ds.Tables[0].Rows[0]["Screening_Number"].ToString();
           LabelVersion.Text = ds.Tables[0].Rows[0]["Version"].ToString();
           LabelId.Text = ds.Tables[0].Rows[0]["Id"].ToString();
           LabelAe.Text = ds.Tables[0].Rows[0]["Ae"].ToString();
           LabelFrequency.Text = ds.Tables[0].Rows[0]["Frequency"].ToString();
           LabelVisit.Text = ds.Tables[0].Rows[0]["Visit"].ToString();
           LabelVisitNum.Text = ds.Tables[0].Rows[0]["VisitNumber"].ToString();
           LabelDateStarted.Text = ds.Tables[0].Rows[0]["Date_Onset"].ToString();
           LabelOngoing.Text = ds.Tables[0].Rows[0]["Ongoing"].ToString();
           LabelDateStopped.Text = ds.Tables[0].Rows[0]["Date_Ended"].ToString();
           LabelCtcae.Text = ds.Tables[0].Rows[0]["CTCAE"].ToString();
           LabelSerious.Text = ds.Tables[0].Rows[0]["Serious"].ToString();
           LabelRelated.Text = ds.Tables[0].Rows[0]["Related"].ToString();
           LabelAction.Text = ds.Tables[0].Rows[0]["Action"].ToString();
           LabelOutcome.Text = ds.Tables[0].Rows[0]["Outcome"].ToString();
           RadioButtonConMedY.Checked = Convert.ToBoolean(ds.Tables[0].Rows[0]["NewConMedsY"].ToString());
           RadioButtonConMedN.Checked = Convert.ToBoolean(ds.Tables[0].Rows[0]["NewConMedsN"].ToString());
           LabelSubBy.Text = Session["Name"].ToString();
           LabelSubOn.Text = medDate;

       }
       catch (Exception ex)  //Catch Errors
       {
           Console.WriteLine("Error : " + ex.Message);
       }

       //Response.Write("<script>document.forms[0].submit();</script>");

   }

I may be confused, both posts together are the code you are using correct? If so, then as I said, you need to use IsPostBack in the PageLoad event so the controls are not overwritten each time the page is loaded, i.e. during a postback caused by the button click. And again, abstract the database code to a separate method. It will save you a lot of typing and cut & paste errors and debugging.

I know the language. I've read a book. - _Madmatt

Yes,Yes,Yes,Yes....OK....."I SEE" said the blind man. Both you and David were right Mark, and now I GET it. When the page re posts, it is running the load event all over again, and that is overwriting the method so it appears that it is unchanged. I am so sorry that I did not understand. You are both saying the same thing.....it took a moment for it to sink in. THANK YOU both very much. I scripted it a bit different, but it is working now. I will try to mark both answers correct, as they both are. If it is not allowed, I guess I will have to stamp Mark's first only since his was sent first. I greatly appreciate the time and skill from both of you, and I hope you will sign in for me again in the future. Best regards, Pat

PDTUM wrote:
I have written a page that accepts new information and then repopulates the page when a button is clicked. This is a simple task in C#, but seems very complicated in ASP.net. The code seems to work fine on the first click, but the after the first click, the page no longer repopulates.

PDTUM wrote:
This page is brought up from a click event on another page's GridView and is supposed to populate information accordingly.

Well I might be a little confused on exactly which is the first click.
But anyways what you need is code like this ...

protected void Page_Load(object sender, EventArgs e)    {
    if (Page.IsPostBack)
            { 
                LabelVersion label gets deincremented here
            }     

    medDate = CreateMedicalDate(medDate);
        //Load the results for the requested AE
        //Pass the values for the selected AE from the AE Summary Page        
id = Request.QueryString["Id"];
        Screening_Number = Request.QueryString["Screening_Number"];
        Site_Number = Request.QueryString["Site_Number"];

and so on ...

Yes,Yes,Yes,Yes....OK....."I SEE" said the blind man. Both you and Mark were right David, and now I GET it. When the page re posts, it is running the load event all over again, and that is overwriting the method so it appears that it is unchanged. I am so sorry that I did not understand. You are both saying the same thing.....it took a moment for it to sink in. THANK YOU both very much. I scripted it a bit different, but it is working now. I will try to mark both answers correct, as they both are. If it is not allowed, I guess I will have to stamp Mark's first only since his was sent first. I greatly appreciate the time and skill from both of you, and I hope you will sign in for me again in the future. Best regards, Pat

hi, iam using asp.net with c#, with sql server 2000

in my gridview iam displaying data from view at page load event
the 1st column is checkbox in template field,2nd is categorynamee,3rd is itemkey, 4th is itemkeyname
5th is currentqty, 6th is salesprice,7th is quantity, 8th is total

i have to insert into two tables

1st table orders

orderno int primary key autoincrement,

username nvarchar(50) ,

shopname nvarchar(50),

email nvarchar(100)

2nd table is Orderdetails

serialno int primarykey autoincrement,

orderno int foreignkey,

categorynamee nvarchar(50),

itemkey nvarchar(50),

itemkeyname nvarchar(50),

currentqty decimal,

salesprice decimal,

quantity int,

total decimal

when user selects any no of the checkboxes that rows should be added in both tables, iam getting errors

can you give examples which helps me

So at the time of subit, Iterate throgh all the gridview rows and which row has checkbox checked, save it in database.You can save the data in both the table using query.

Where are you actually facing problem?

Cheers!!
Brij
Check my latest Article :Exploring ASP.NET Validators

Easy, your code is wrong - what else do you expect it to be?

Without seeing your code or knowing what errors you are getting someone is meant to help you fix the problem. Can you see where the problem really lies?

Bob
Ashfield Consultants Ltd

What errors are you getting?

developerit wrote:
can you give examples which helps me

Search google, you'll find many examples on this.

Hi,

I have the following problem:

Two custom controls, first control has a button, when I click this button I'd like to render the second custom control content in popup window. How to do it?

Please, help.

So what is the problem, have a page with second custom control and on button click open that page in popup. You can also use ajaxmodelpopupextender.

Cheers!!
Brij
Check my latest Article :Exploring ASP.NET Validators

You can use the AjaxControlToolkit to perform this action.

I would like to call some methods at the very beginning of my web application. Also, I want to ensure that those methods are called only once per application lifetime, no matter what. What is the best way to accomplish this?

TRY THIS

protected void Page_Load(object sender, EventArgs e)
{
   if(!IsPostBack)
    {
       FillConatcsGrid();//fills you contacts datagrid only once
       CheckSessionId();//Will check the session id if need be only once
       //Then you can go ahead with more fun in here...
    }
}

GoodLuck

This will not work as user may start my application from different page

If your methods are Application specific, and wiil be same for all then users then you can call your methopds from the function Application_Start of Global.asax file.
and if it user specific then you can call your methopds from the function Session_Start of Global.asax file.

Cheers!!
Brij
Check my latest Article :Exploring ASP.NET Validators