Set Current Date to TemplateField of a DetailView - asp.net

Question

I'm using a DetailView to insert data into a GridView via an sqlDataSource. I'm attempting to set one of the fields of the DetailView to the current date/time on Page Load so the user does not have to enter the date/time. I get no errors - however, the "Update Date" field of the DetailView fails to display the current date/time.
This is my hypertext:
<asp:DetailsView
id="dtlShipModes"
DataSourceID="SqlDataSource1"
AutoGenerateRows="False"
DefaultMode="Insert"
Runat="server" BackColor="White" BorderColor="White" BorderStyle="Ridge"
BorderWidth="2px" CellPadding="3" CellSpacing="1" GridLines="None">
<EditRowStyle BackColor="#9471DE" Font-Bold="True" ForeColor="White" />
<Fields>
<asp:BoundField
DataField="ShipMode"
HeaderText="Ship Mode:" />
<asp:CheckBoxField
DataField="Active"
HeaderText="Active:" />
<asp:TemplateField HeaderText="Update Date:">
<EditItemTemplate>
<asp:TextBox ID="txtUpdateDate" runat="server" Text='<%# Bind("UpdateDate") %>'></asp:TextBox>
</EditItemTemplate>
<InsertItemTemplate>
<asp:TextBox ID="txtUpdateDate" runat="server" Text='<%# Bind("UpdateDate") %>'></asp:TextBox>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("UpdateDate") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField
DataField="UpdateBY"
HeaderText="Update BY:" />
<asp:CommandField ShowInsertButton="true" InsertText="Add" />
</Fields>
<FooterStyle BackColor="#C6C3C6" ForeColor="Black" />
<HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#E7E7FF" />
<PagerStyle BackColor="#C6C3C6" ForeColor="Black" HorizontalAlign="Right" />
<RowStyle BackColor="#DEDFDE" ForeColor="Black" />
</asp:DetailsView>
This is the code behind:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim txtupdatedby As String = DirectCast(dtlShipModes.FindControl("txtUpdateDate"), TextBox).Text
txtupdatedby = DateTime.Now.ToString
End Sub
Could I get some help please as to what I'm doing wrong?

Answer 1

To expand a little on Mych's answer, you would want to handle the ItemCreated event of the DetailsView:
<asp:DetailsView
id="dtlShipModes"
DataSourceID="SqlDataSource1"
AutoGenerateRows="False"
DefaultMode="Insert"
ItemCreated="dtlShipModes_ItemCreated"
Runat="server" BackColor="White" BorderColor="White" BorderStyle="Ridge"
BorderWidth="2px" CellPadding="3" CellSpacing="1" GridLines="None">
And then write the event handler like this:
protected void dtlShipModes_ItemCreated(Object sender, EventArgs e)
{
Dim txtupdatedby As TextBox = DirectCast(dtlShipModes.FindControl("txtUpdateDate"), TextBox)
txtupdatedby.Text = DateTime.Now.ToString
}
Notice that I changed your implementation a little, to use a reference to the TextBox, rather than the string.
This is all necessary because the DetailsView is not loaded with data yet in the Page's Load event.

Answer 2

You need to set your date when the Items in the DataView are being bound to the datasource. You need to use the ItemCreated event....
See... http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.detailsview.itemcreated(v=vs.110).aspx