unable to resolve RowDataBound problem

[usman]

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

        {

        //access_layerDataContext db=new access_layerDataContext();

        ques_tbl t1= new ques_tbl();

            if (e.Row.DataItem == "qAnswered")

            {

                Image img = (Image)e.Row.FindControl("image1");

                if (t1.qanswered == true)

                {

                    img.ImageUrl = "/images/question_mark.jpg";

                }

            }

            }
Is my code with simple asp.net Grid 
now for telerik I wrote the following but its not helping me .

protected void RadGrid1_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
    {

        if (e.Item.Cells[1].Text== "True")
        {
            Image img = (Image)e.Item.FindControl("Image1");
            img.ImageUrl = "/images/question_mark.jpg";

        }
    }

and I am getting this error ,at Line 55  the index is out of Range .

Line 53:     {
Line 54:         ques_tbl t1 = new ques_tbl();
Line 55:         if (e.Item.Cells[1].Text== "True")
Line 56:         {
Line 57:             Image img = (Image)e.Item.FindControl("Image1");

[Shinu]

Hello Usman,

I suppose you want to access Image based on some conditions. Try the following code snippet to achieve your scenario.
C#:

protected void grid_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
{

   if (e.Item is GridDataItem)

   {

      GridDataItem dataitem = (GridDataItem)e.Item;

       TableCell cell = (TableCell)dataitem["Uniquename"];

        if (cell.Text == "qAnswered")

        {

           Image img = (Image)dataitem.FindControl("image1");

        }
      }
}

Also check the following help documentation.
Accessing Cells and Rows

-Shinu.

[usman]

thanks for reply 
 Kindly tell what is GridDataItem ? what is its type ?

[Jayesh Goyani]

Hello usman,

Each row is represented by a GridDataItem in telerik Radgrid for normal mode.
for more info check this link.

Thanks,
Jayesh Goyani

[usman]

thanks , problem solved 
hats off to Telerik Community 

[usman]

There is one small issue left , my grid was autoupdating by AJAX before including the above code , but now its not working I mean now its not updating the grid after my timer expires 

[Jayesh Goyani]

Hello usman,

Please provide your code so i can check it.

Thanks,
Jayesh Goyani

[usman]

public partial class questions : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        BindGrid();

    }

    protected void Timer1_Tick(object sender, EventArgs e)
    {
        //Label1.Text = "Grid Refreshed at: " + DateTime.Now.ToLongTimeString();
    }
    public void BindGrid()
    {
        //NorthWindDataContext db = new NorthWindDataContext();
        //var products = from p in db.Products select new { p.CategoryID, p.Discontinued };
        //GridView1.DataSource = products;
        //GridView1.DataBind();
        access_layerDataContext db = new access_layerDataContext();

        var query = from row in db.ques_tbls select row;
        ques_tbl t1 = new ques_tbl();


        if (t1.qanswered == true)
        { t1.qDetail = "answer wala ry"; }
        else { t1.qDetail = "question wala ry"; }
        db.SubmitChanges();
        this.RadGrid1.DataSource = query;
        this.RadGrid1.DataBind();
    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
        //access_layerDataContext db=new access_layerDataContext();
        ques_tbl t1= new ques_tbl();
            if (e.Row.DataItem == "qAnswered")
            {
                Image img = (Image)e.Row.FindControl("image1");
                if (t1.qanswered == true)
                {
                    img.ImageUrl = "/images/question_mark.jpg";
                }
            }
            }
    protected void RadGrid1_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
    {
        //ques_tbl t1 = new ques_tbl();
        //if (e.Item.Cells[1].Text== "True")
        //{
        //    Image img = (Image)e.Item.FindControl("Image1");
        //    img.ImageUrl = "/images/question_mark.jpg";

        //}

        if (e.Item is GridDataItem)
        {
            GridDataItem dataitem = (GridDataItem)e.Item;
            TableCell cell = (TableCell)dataitem["qAnswered"];
            if (cell.Text == "True")
            {
                Image img = (Image)dataitem.FindControl("Image1");
                img.ImageUrl = "~/images/question-mark.jpg";
                this.RadGrid1.Rebind();
            }
            else return;
        }
    }
}

[usman]

aspx code 

<%@ Page Title="" Language="C#" MasterPageFile="~/master.Master" AutoEventWireup="true" CodeFile="questions.aspx.cs" Inherits="questions" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<asp:Content ID="Content1" ContentPlaceHolderID="main" Runat="Server">
    <div style="width: 1130px; position: relative; top: -1px; left: 96px">
        <telerik:RadScriptManager ID="RadScriptManager1" Runat="server">
        </telerik:RadScriptManager>
</div>
<div style="width: 1130px; height: 30px; position: relative; top: -1px; left: 96px; height: 97px;">
<div>

<asp:Timer ID="Timer1" OnTick="Timer1_Tick" runat="server" Interval="10000">
</asp:Timer>
</div>
    <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" Width="1130px">
       <telerik:RadGrid ID="RadGrid1" runat="server" CellPadding="0"
            ItemStyle-Height="40px" AlternatingItemStyle-Height="40px"
        GridLines="None"  Skin="Web20"  Font-Bold="False"
        Font-Italic="False" Font-Overline="False" Font-Strikeout="False"
        Font-Underline="False" AllowPaging="True"
            onitemdatabound="RadGrid1_ItemDataBound">
<MasterTableView AutoGenerateColumns="false" GridLines="None">
<Columns>
<telerik:GridTemplateColumn ItemStyle-Width="60px" >
 <ItemTemplate>
                <asp:Image ID="Image1" runat="server" />
  </ItemTemplate>
</telerik:GridTemplateColumn>

<telerik:GridBoundColumn DataField="qTitle" HeaderText="Title" ></telerik:GridBoundColumn>
<telerik:GridDateTimeColumn DataField="qDate" HeaderText="Posted On" ItemStyle-Width="250px"></telerik:GridDateTimeColumn>
<telerik:GridBoundColumn DataField="qAnswered" ></telerik:GridBoundColumn>
</Columns>
<RowIndicatorColumn FooterStyle-Font-Size="Medium" >
<HeaderStyle Width="40px"></HeaderStyle>
</RowIndicatorColumn>

<ExpandCollapseColumn>
<HeaderStyle Width="40px"></HeaderStyle>
</ExpandCollapseColumn>

    <HeaderStyle Font-Bold="True" Font-Italic="False" Font-Names="Arial"
        Font-Overline="False" Font-Size="Small" Font-Strikeout="False"
        Font-Underline="False" Wrap="True" />
</MasterTableView>

        <ItemStyle  Font-Bold="False" Font-Italic="False"
            Font-Overline="False" Font-Strikeout="False" Font-Underline="False"
            Wrap="True" />
<HeaderContextMenu EnableAutoScroll="True"></HeaderContextMenu>
<ClientSettings>
<ClientEvents OnCommand="function(){ }" />
</ClientSettings>
    </telerik:RadGrid>

  </telerik:RadAjaxPanel>


    <br />

</div>
    <telerik:RadAjaxManager runat="server">
        <AjaxSettings>
            <telerik:AjaxSetting AjaxControlID="Timer1">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="RadGrid1" />

                </UpdatedControls>
            </telerik:AjaxSetting>
        </AjaxSettings>
    </telerik:RadAjaxManager>
    </asp:Content>

[Shinu]

Hello Usman,

I suppose this is a databinding issue. Make sure that you are populating the grid with advanced data binding using NeedDataSource event which fires each time when it needs to be bound to a data source. In the TimerTick event call Rebind() method. Check the following help documentation which explains more about this.
Advanced Data-binding (using NeedDataSource event)

-Shinu.

[usman]

I dont agree , just because I included the conditional image data binding ,the AJAX stopped working 

[Jayesh Goyani]

Hello usman,

I agree with shinu, if possible then use Advance Data Binding because it will automatically handle sorting,pagging,filter...etc
or
Also check below code snippet for your code

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

    protected void Timer1_Tick(object sender, EventArgs e)
    {
         BindGrid();
    }

Let me know it worked or not ??

Thanks,
Jayesh Goyani