How to solve Index Out of range exception ?

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C#

ASP.NET

Compilation Error:
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0266: Cannot implicitly convert type 'long' to 'int'. An explicit conversion exists (are you missing a cast?)

Source Error:


Line 270:
Line 271:            
Line 272:            n_sno = Convert.ToInt64(((TextBox)(row.Cells[1].Controls[0])).Text);
Line 273:            n_date = ((TextBox)(row.Cells[2].Controls[1])).Text.Trim();
Line 274:            n_c_ref = ((TextBox)(row.Cells[3].Controls[2])).Text.Trim();


Source File: c:\Users\bhushan.COMTEK\Desktop\Halo Convert in Publication\PublicationWeb\Indent.aspx.cs    Line: 272

plz check this code.......
firstly i'm taking old values then new values then new value inserted in gridvalue but when i'm taking new serialnumber: show exception- Index out of range.

Error line is this : n_sno = Convert.ToInt16(((TextBox)(row.Cells[1].Controls[0])).Text);

protected void grid_indent_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    try
    {
        // retrieve the table from the session object...
       // DataTable dt = (DataTable)Session["grid_value"];

        // update the values of grid...
        List<item_list> objList = (List<item_list>)Session["listdata"];

        GridViewRow row = grid_indent.Rows[e.RowIndex];
        
        o_sno = objList[row.DataItemIndex].serialnumber;
        o_date = objList[row.DataItemIndex].date;
        o_c_ref = objList[row.DataItemIndex].coderef;
        o_i_name = objList[row.DataItemIndex].item_name;
        o_inhand = objList[row.DataItemIndex].inhand;
        o_request = objList[row.DataItemIndex].newrequest;
        o_rate = objList[row.DataItemIndex].rate;
        o_amt = objList[row.DataItemIndex].amount;
     
        n_sno = Convert.ToInt16(((TextBox)(row.Cells[1].Controls[0])).Text);
        n_date = ((TextBox)(row.Cells[2].Controls[1])).Text.Trim();
        n_c_ref = ((TextBox)(row.Cells[3].Controls[2])).Text.Trim();
        n_i_name = ((TextBox)(row.Cells[4].Controls[3])).Text.Trim();
        n_inhand = Convert.ToInt32(((TextBox)(row.Cells[5].Controls[4])).Text.Trim());
        n_request = Convert.ToInt32(((TextBox)(row.Cells[6].Controls[5])).Text.Trim());
        n_rate = ((TextBox)(row.Cells[7].Controls[6])).Text.Trim();
        n_amt = ((TextBox)(row.Cells[8].Controls[7])).Text.Trim();

        objList[row.DataItemIndex].serialnumber =n_sno;
        objList[row.DataItemIndex].date = n_date;
        objList[row.DataItemIndex].coderef = n_c_ref;
        objList[row.DataItemIndex].item_name = n_i_name;
        objList[row.DataItemIndex].inhand = n_inhand;
        objList[row.DataItemIndex].newrequest = n_request;
        objList[row.DataItemIndex].rate = n_rate;
        objList[row.DataItemIndex].amount = n_amt;
    
        grid_indent.EditIndex = -1;
        popUpData();
    }
    catch (Exception ex)
    {
        Response.Write(ex.Message);
    }
    finally
    { }
}

thanks in advance...
Bhushan