Dropdownlist in gridview not firing selectedindex changed event

Question

I have problem with not firing selected index changed event of dropdownlist in gridview. I gone through the SO Thread . It is not worked wholly for me. I have implementation like below.

.ASPX

<asp:DropDownList ID="DDL1" runat="server" AutoPostBack="true"   OnSelectedIndexChanged="DDL1_SelectedIndexChanged">
  <asp:ListItem Text="Review" Value="Review" Selected="True">Review</asp:ListItem>
  <asp:ListItem Text="Level1" Value="lvl1">Send Back to Level1</asp:ListItem>
</asp:DropDownList>

.CS

protected void Page_Load(object sender, EventArgs e)
  {
   if(!Page.IsPostBack)
  {
    // Bind the GridView to something.
       DataBindGrid();
  }
 else {
    // Bind the GridView again to maintain previous entered data in the gridview
       DataBindGrid();
  }
  }

  protected void DDL1_SelectedIndexChanged(object sender, EventArgs e)
  {
      this.lblCity.Text = ((DropDownList)sender).SelectedValue;
  }

protected void grdPoll_RowDataBound(object sender, GridViewRowEventArgs e)
{
  if(Page.IsPostBack)
  {
    if(e.Row.RowType == DataControlRowType.DataRow)
    {
      DropDownList ddl = e.Row.FindControl("DDL1") as DropDownList;
      if(ddl != null)
      {
        ddl.SelectedIndexChanged += new EventHandler(DDL1_SelectedIndexChanged);
      }
    }
  }
}

When i keep if(!Page.IsPostBack) block only then it works fine. But i want else block also. Whats going wrong with implentation. Can you please suggest the solutions

score 2 · Accepted Answer · answered Nov 27 '12 at 07:33

2

The problem is block after !Page.IsPostBack block, which is not event else part as you said. You are binding grid again on post back which results in loss of the event being fired. You do not have to bind it again to have the changes in the grid.

Remove this code.

{
   // Bind the GridView again to maintain previous entered data in the gridview
   DataBindGrid();
}

answered Nov 27 '12 at 07:33

Adil

146,340
25
209
204

I want to bind it again on postback where i am assigning different updated datasource to gridview – Rajaram Shelar Nov 27 '12 at 08:07
Then you should bind it in some event instead of Page_load could be in DDL1_SelectedIndexChanged – Adil Nov 27 '12 at 08:59

score 0 · Answer 2 · answered Nov 27 '12 at 08:51

0

Try this:

protected void Page_Load(object sender, EventArgs e)
{
   if(!Page.IsPostBack)
  {
    // Bind the GridView to something.
       DataBindGrid();
  }
 else {
    // Bind the GridView again to maintain previous entered data in the gridview
       //DataBindGrid(); //remove DataBindGrid(); from else
  }
}

protected void DDL1_SelectedIndexChanged(object sender, EventArgs e)
{
     this.lblCity.Text = ((DropDownList)sender).SelectedValue;
     DataBindGrid();
}

answered Nov 27 '12 at 08:51

Jhabar

109
10

remove DataBindGrid(); from DDL1_SelectedIndexChanged event and caode put in if(!Page.IsPostBack) { // Bind the GridView to something. DataBindGrid(); } else { // Bind the GridView again to maintain previous entered data in the gridview DataBindGrid(); } – Naresh Pansuriya Nov 27 '12 at 09:34

score -1 · Answer 3 · answered Nov 27 '12 at 09:36

-1

replace event name "Page_Load" with "Page_PreRender"

answered Nov 27 '12 at 09:36

Naresh Pansuriya

2,027
12
15

Dropdownlist in gridview not firing selectedindex changed event

3 Answers3