Detail view cell value is null how to come out

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C#

ASP.NET

Hi

Below is my aspx code for detail view.
My problem is i have a value in cusid field but it is coming as null.
Could you please correct me where i am going wrong.

<asp:DetailsView ID="DetailsView1" runat="server" DataSourceID="customerds1" Height="178px"
                                                        Width="438px" AutoGenerateRows="False" CellPadding="4" DataKeyNames="CusId" ForeColor="#333333"
                                                        GridLines="None" OnPageIndexChanging="DetailsView1_PageIndexChanging" AutoGenerateDeleteButton="True"
                                                        AutoGenerateEditButton="True" Visible="False">
                                                        <footerstyle backcolor="#5D7B9D" font-bold="True" forecolor="White" />
                                                        <commandrowstyle backcolor="#E2DED6" font-bold="True" />
                                                        <rowstyle backcolor="#F7F6F3" forecolor="#333333" />
                                                        <fieldheaderstyle backcolor="#E9ECF1" font-bold="True" />
                                                        <pagerstyle backcolor="#284775" forecolor="White" horizontalalign="Center" />
                                                        <fields>
                                                            <asp:TemplateField HeaderText="Customer ID:" SortExpression="CusId">
                                                                <edititemtemplate>
                                                                    <asp:Label ID="Label1" runat="server" Text='<%# Eval("CusId") %>'>
                                                                </edititemtemplate>
                                                                <insertitemtemplate>
                                                                    <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("CusId") %>'>
                                                                </insertitemtemplate>
                                                                <itemtemplate>
                                                                    <asp:Label ID="Label1" runat="server" Text='<%# Bind("CusId") %>'>
                                                                </itemtemplate>
                                                            
                                                            <asp:BoundField DataField="CompName" HeaderText="CompanyName:" SortExpression="CompName" />
                                                            <asp:BoundField DataField="CompAdd" HeaderText="CompanyAdd:" SortExpression="CompAdd" />
                                                            <asp:BoundField DataField="Tel" HeaderText="Tel:" SortExpression="Tel" />
                                                            <asp:BoundField DataField="Fax" HeaderText="Fax:" SortExpression="Fax" />
                                                            <asp:BoundField DataField="ContPerson" HeaderText="Contact Person:" SortExpression="ContPerson" />
                                                            <asp:TemplateField HeaderText="Sales Person:" SortExpression="SalesPerson">
                                                                <edititemtemplate>
                                                                    <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("SalesPerson") %>'>
                                                                </edititemtemplate>
                                                                <insertitemtemplate>
                                                                    <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("SalesPerson") %>'>
                                                                </insertitemtemplate>
                                                                <itemtemplate>
                                                                    <asp:Label ID="Label2" runat="server" Text='<%# Bind("SalesPerson") %>'>
                                                                </itemtemplate>
                                                            
                                                        </fields>
                                                        <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
                                                        <editrowstyle backcolor="#999999" />
                                                        <alternatingrowstyle backcolor="White" forecolor="#284775" />

cs code

string cusId = DetailsView1.Rows[0].Cells[1].Text;