get value of a cell in a dynamic gridview

I am not sure what do you mean by dynamucally created grid on that context.

If you are creating control like this way,

GridView grdView= new GridView();
grdView.DataSource=myDataSource;

You can access the GridRows by using GridViewRows Class

GridViewRows gridviewRow= grdView.SelectedRow;

Now from gridviewRow you get value of any cell for that row, You can also go with as Sunasara suggested to get value directly from a Cell.

Hope this will help you !

TextBox abc=(TextBox)Gridview1.Rows[e.Rowindex].Cells[0].Controls[0];

this is for first position of gridview binding item.and here you can convert as per your control of choice like textbox, label etc.

another ways is like as

TextBox abc=(TextBox)Gridview1.Rows[e.Rowindex].Cells[0].FindControl("controlname");

as you have used in item template of gridview.

<pre lang="xml"><asp:GridView ID="gvAttendance" runat="Server"
                      AllowPaging="True"
                      AutoGenerateColumns="true" PageSize="10"
                      SelectedIndex="0" Width="465px"
                      CssClass="mGrid" PagerStyle-CssClass="pgr"
                      AlternatingRowStyle-CssClass="alt"

                      DataSourceID="sqlDSAttendance" DataMember="DefaultView"
            onrowdatabound="gvAttendance_RowDataBound"
            onrowcommand="gvAttendance_RowCommand" >
            <EmptyDataTemplate>
                <asp:Label ID="lblNull" runat="Server"
                           ForeColor="Red"> There&#39;s no data to show in this view...
                </asp:Label>
            </EmptyDataTemplate>
        </asp:GridView>
    </div>
</div>
<asp:SqlDataSource ID="sqlDSAttendance" runat="server"
                   ConnectionString="<%$ ConnectionStrings:OTEConnString %>"
                   ProviderName="MySql.Data.MySqlClient"
                   SelectCommand = "CALL ote.pivotwizard('AgentID,AgentNo,Agent_Name','att_Date','att_Time','ote.view_attendance','((agent_name IS NOT NULL) OR (year(att_date)=2010))')">
</asp:SqlDataSource>

This is my code for binding the gridview. the auto populate is set to true because the data is dynamic when it comes to adding some column. so I need to get the value of the cell that was clicked by the client for update.

for(int i<gvAttendance.rows.count; i++)
{
Label lblAttendance=(Label)gvAttendance.Rows[i].findcontrol("lblNull");

}