ASP.Net gridview getting cleared on postback

Question

5.00/5 (1 vote)

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Hi,

I am having a editable gridview which is populated on the click of "Load Data" button.

For saving the edited values in the grid, there is another button called "Save" on the same page.

On clicking save button, the page is getting posted back and gridview values are getting cleared, due to which i am not able to save the latest data.

I am working on ASP.Net 4.0

Any help would be greatly appreciated.

Code of .cs file --

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        populateDropDown();
    }
}

protected void btnLaunchTour_Click(object sender, EventArgs e)
{
    try
    {
        ///Code for populating Grid on Launch Button Click
        populateGrid(TourLaunchDAL.LaunchTour(0, Convert.ToInt32(ddlProduct.SelectedValue), Convert.ToInt32(txtNoOfTours.Text), UserDetails.UserID));
    }
    catch (Exception ex)
    {
        ErrorMessage = ex.Message;
    }

}

protected void populateGrid(List<TourLaunchBAL> lstTourSchedule)
{
    grdTourSchedule.DataSource = lstTourSchedule;
    grdTourSchedule.DataBind();
}

protected void populateDropDown()
{
    ListItem lstItem = new ListItem("Select", "0");

    ddlProduct.AppendDataBoundItems = true;
    ddlProduct.Items.Add(lstItem);

    ddlProduct.DataSource = CacheMaster.getProductsForLaunch();
    ddlProduct.DataTextField = "ProductName";
    ddlProduct.DataValueField = "ProductID";
    ddlProduct.DataBind();
}
protected void grdTourSchedule_RowCommand(object sender, GridViewCommandEventArgs e)
{

}
protected void grdTourSchedule_RowDataBound(object sender, GridViewRowEventArgs e)
{

}

protected void btnSave_Click(object sender, EventArgs e)
{
    foreach (GridViewRow gvRow in grdTourSchedule.Rows)
    {

    }
}

Thanks

Posted 18-Sep-13 23:02pm

Madhu Nair

Updated 8-Mar-18 1:01am

v2

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Comments

Thanks7872 19-Sep-13 5:09am

On Save button click,commit changes into database and then bind gridview again.

Madhu Nair 19-Sep-13 5:39am

On Save button click, i am not getting any rows of gridview

Thanks7872 19-Sep-13 5:47am

Use Improve question and post the relevant code for save button,page_load.

Madhu Nair 19-Sep-13 5:57am

i am not populating grid on page load... but on button click... again on save button click i am trying to save data... but not getting any rows

Dholakiya Ankit 19-Sep-13 5:41am

have u added
if(!page.ispostback)
{}
at page load?

Madhu Nair 19-Sep-13 5:44am

yes... but again, i am populating the grid on Load data button click

Dholakiya Ankit 19-Sep-13 5:53am

so populating done but on save its not working right?

Madhu Nair 19-Sep-13 5:56am

Yes... on click of save button grid view data is getting cleared

Dholakiya Ankit 19-Sep-13 6:00am

put your code in improve question

1 solution

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Madhu Nair · Accepted Answer · 2013-09-19T01:29:00

Managed to Solved the issue by making the following changes in the code--

protected void populateGrid(List<tourlaunchbal> lstTourSchedule)
{
grdTourSchedule.EnableViewState = true;

grdTourSchedule.DataSource = lstTourSchedule;
grdTourSchedule.DataBind();
ViewState["lstTourSchedule"] = lstTourSchedule;
//grdTourSchedule.EnableViewState = true;

}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
populateDropDown();
}

if (grdTourSchedule.Rows.Count == 0)
{
grdTourSchedule.DataSource = (List<tourlaunchbal>)ViewState["lstTourSchedule"];
grdTourSchedule.DataBind();
}
}
Now i am able to get modified rows also.

Thanks for all the help