ASP.NET

           <asp:GridView ID="gv1" runat="server" AutoGenerateColumns="False"
               OnRowEditing="gv1_RowEditing" OnRowCancelingEdit="gv1_RowCancelingEdit"
               OnRowUpdating="gv1_RowUpdating" CellPadding="4" ForeColor="#333333">
               <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
               <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
               <Columns>
                   <asp:CommandField ShowEditButton="True" />
                   <asp:BoundField DataField="RecipientAgency" HeaderText="Recipient Agency" InsertVisible="False"
                       ReadOnly="True" SortExpression="RecipientAgency" />
                   <asp:TemplateField HeaderText="Carry Over Year" InsertVisible="False" SortExpression="CarryOverYear">
                       <EditItemTemplate>
                           <asp:TextBox ID="txtCarryOverYear" runat="server" Visible="<%# IsInEditMode %>" Text='<%# Bind("CarryOverYear") %>'></asp:TextBox>
                       </EditItemTemplate>
                       <ItemTemplate>
                           <asp:Label ID="lblCarryOverYear" runat="server" Visible='<%# !(bool) IsInEditMode %>' Text='<%# Bind("CarryOverYear") %>'></asp:Label>
                           <asp:TextBox ID="txtCarryOverYear" runat="server" Visible="<%# IsInEditMode %>" Text='<%# Bind("CarryOverYear") %>'></asp:TextBox>
                       </ItemTemplate>
                   </asp:TemplateField>
                   <asp:TemplateField HeaderText="Diverted Year" InsertVisible="False" SortExpression="DivertedYear">
                       <EditItemTemplate>
                           <asp:TextBox ID="txtDivertedYear" runat="server" Visible='<%# IsInEditMode %>' Text='<%# Bind("DivertedYear") %>'></asp:TextBox>
                       </EditItemTemplate>
                       <ItemTemplate>
                           <asp:Label ID="lblDivertedYear" runat="server" Visible='<%# !(bool) IsInEditMode %>' Text='<%# Bind("DivertedYear") %>'></asp:Label>
                           <asp:TextBox ID="txtDivertedYear" runat="server" Visible='<%# IsInEditMode %>' Text='<%# Bind("DivertedYear") %>'></asp:TextBox>
                       </ItemTemplate>
                   </asp:TemplateField>
                   <asp:TemplateField HeaderText="Jul" SortExpression="Jul">
                       <EditItemTemplate>
                           <asp:TextBox ID="txtJul" runat="server" Visible='<%# IsInEditMode %>' Text='<%# Bind("Jul") %>'></asp:TextBox>
                       </EditItemTemplate>
                       <ItemTemplate>
                           <asp:Label ID="lblJul" runat="server" Visible='<%# !(bool) IsInEditMode %>' Text='<%# Bind("Jul") %>'></asp:Label>
                           <asp:TextBox ID="txtJul" runat="server" Visible='<%# IsInEditMode %>' Text='<%# Bind("Jul") %>'></asp:TextBox>
                       </ItemTemplate>
                   </asp:TemplateField>
</Columns>
               <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
               <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
               <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
               <EditRowStyle BackColor="#999999" />
               <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
           </asp:GridView>

public partial class MonthlyPerformance : System.Web.UI.Page
{
    protected bool IsInEditMode=false;


    protected void gv1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        IsInEditMode = true;
        var temp = ((TextBox)gv1.Rows[e.NewEditIndex].FindControl("txtCarryOverYear"));
        var t=temp.Visible;// = IsInEditMode;
    }

    protected void gv1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        IsInEditMode = false;
        e.Cancel = true;
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        LoadList();
    }

    protected void gv1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
    }
    private void LoadList()
    {
        string strSQL;
        DataSet ds = null;
        IDataReader dr = null;
        double Total = 0;

        DataSet dsByHand = new DataSet();
        dsByHand.Tables.Add();

        //ds.Tables[0].NewRow();
        //dsByHand.Tables[0].Rows.Add(dsByHand.Tables[0].NewRow());

        dsByHand.Tables[0].Columns.Add("RecipientAgency");
        dsByHand.Tables[0].Columns.Add("CarryOverYear");
        dsByHand.Tables[0].Columns.Add("DivertedYear");
        dsByHand.Tables[0].Columns.Add("Jul");
        dsByHand.Tables[0].Columns.Add("Aug");
        dsByHand.Tables[0].Columns.Add("Sep");
        dsByHand.Tables[0].Columns.Add("Oct");
        dsByHand.Tables[0].Columns.Add("Nov");
        dsByHand.Tables[0].Columns.Add("Dec");
        dsByHand.Tables[0].Columns.Add("Jan");
        dsByHand.Tables[0].Columns.Add("Feb");
        dsByHand.Tables[0].Columns.Add("Mar");
        dsByHand.Tables[0].Columns.Add("Apr");
        dsByHand.Tables[0].Columns.Add("May");
        dsByHand.Tables[0].Columns.Add("Jun");
        dsByHand.Tables[0].Columns.Add("TotalProductProduced");
        dsByHand.Tables[0].Columns.Add("TransfToState");
        dsByHand.Tables[0].Columns.Add("Adjustment");
        dsByHand.Tables[0].Columns.Add("EndingBalance");
        var tempr = dsByHand.Tables[0].NewRow();
        tempr.ItemArray[0] = "Test Temp";
        dsByHand.Tables[0].Rows.Add(tempr);

        gv1.DataSource = dsByHand.Tables[0];
        gv1.AutoGenerateColumns = false;
        gv1.DataBind();

    }
}//end of class