How to access textbox which is inside EditItemTemplate?

How to access textbox which is inside EditItemTemplate?

< asp : DetailsView ID ="DetailsView1" runat ="server" Height ="50px" Width ="125px"

AutoGenerateRows="False" DataKeyNames="id" DataSourceID="SqlDataSource1"

AllowPaging="True" >

<Fields>

<asp:BoundField DataField="id" HeaderText="id" InsertVisible="False"

ReadOnly="True" SortExpression="id" />

<asp:TemplateField HeaderText="myRow" SortExpression="myRow">

<EditItemTemplate>

<asp:Label ID="Label2" runat="server" Text="Please type row number:"></asp:Label>

< br />
< asp : TextBox ID ="txtRowNumber" runat ="server" csCssClass ="clsFind"></ asp : TextBox >

<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("myRow") %>'></asp:TextBox>

</EditItemTemplate>

<InsertItemTemplate>

<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("myRow") %>'></asp:TextBox>

</InsertItemTemplate>

<ItemTemplate>

<asp:Label ID="Label1" runat="server" Text='<%# Bind("myRow") %>'></asp:Label>

</ItemTemplate>

</asp:TemplateField>

<asp:CommandField ShowDeleteButton="True" ShowEditButton="True" ShowInsertButton="True" />

<asp:TemplateField HeaderText="Delete" ItemStyle-HorizontalAlign ="Left" ItemStyle-Width ="20%">

<ItemTemplate>

<asp:LinkButton ID="lnkDelete" runat="server" Text="Delete" CommandName ="delete" CssClass ="clsFind"> </asp:LinkButton>

<asp:LinkButton ID="lnkShow" runat="server" Text="show" CssClass ="clsFind"> </asp:LinkButton>

</ItemTemplate>

<

 ItemStyle HorizontalAlign ="Left" Width ="20%"></ ItemStyle >

</asp:TemplateField>

</Fields>

</asp:DetailsView>

 
// My Question: How to access properties of txtRowNumber?