c# - Unable to select my gridview row of data -


i've added gridview asp.net webapp. added select button in gridview. however, when click select button in gridview, receive error

enter image description here

here gridview code

<asp:gridview id="gvnric" runat="server"  align="center" width="30%"          backcolor="#cccccc" allowsorting="true" onsorting="gvnric_sorting"          bordercolor="#999999" borderstyle="solid" borderwidth="3px" cellpadding="4"          cellspacing="2" forecolor="black" autogenerateselectbutton="true"          onselectedindexchanged="gvnric_selectedindexchanged" allowpaging="true"          pagesize="5" onpageindexchanging="gvnric_pageindexchanging">         <footerstyle backcolor="#cccccc" />         <headerstyle backcolor="black" font-bold="true" forecolor="white" />         <pagerstyle backcolor="#cccccc" forecolor="black" horizontalalign="left" />         <rowstyle backcolor="white" />         <selectedrowstyle backcolor="#000099" font-bold="true" forecolor="white" />         <sortedascendingcellstyle backcolor="#f1f1f1" />          <sortedascendingheaderstyle backcolor="#808080" />         <sorteddescendingcellstyle backcolor="#cac9c9" />         <sorteddescendingheaderstyle backcolor="#383838" />         </asp:gridview>

this format of gridview code working out fine other page not current one. why so?

this how bind data in gridview loadgrid. uses loadgrid paging

private void loadgrid()     {          sqlconnection conn = new sqlconnection(configurationmanager.connectionstrings["connectionstring"].connectionstring);         //conn.connectionstring = "data source = localhost; initial catalog = majorproject; integrated security= sspi";         conn.open();          dataset ds = new dataset();          sqldataadapter da = new sqldataadapter("select nric [nric] memberaccount status = 'unverified'", conn);         da.fill(ds);          gvnric.datasource = ds.copy();         gvnric.databind();          conn.close();      }

i re-bind using databindbydataset. time gridview sorting

private datatable databindbydataset()     {         sqlconnection conn = new sqlconnection(configurationmanager.connectionstrings["connectionstring"].connectionstring);         //conn.connectionstring = "data source = localhost; initial catalog = majorproject; integrated security= sspi";         conn.open();          dataset ds = new dataset();          sqldataadapter da = new sqldataadapter("select nric [nric] memberaccount status = 'unverified'", conn);         da.fill(ds);          conn.close();          return ds.tables[0];     }

all other pages uses 2 different way of binding assist in paging , sorting not gridview. binding codes same both loadgrid , databindbydataset each have different uses. found link asked similiar question doesn't help.

selectedindexchanged code of gridview wrong detect row.


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