Hello,

How do you display the current date and time in a textbox on a webform? I have been using the below code, but receive error because is says the textbox is not delcared. I have the textbox plased on the InsertItmeTemplate of a webform.


 Protected Sub time_stamp_entryTextBox_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim dtNow As DateTime = DateTime.Now
        time_stamp_entryTextBox.Text = dtNow.ToString
    End Sub

First you could shorten this up a bit:
time_stamp_entryTextBox.Text = DateTime.Now.ToString()

Secondly, show us how you have declared your textbox.

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Hello,

I have shortened the textbox to txtboxTimeEntry. Also, I have delceared the textbox by placing a textbox into the main Content Area, before the FormView Section. This is the only way that I know how to do this at the present time. I have read an article (http://www.eps-software.xn--comwww-y...0503051&page=1), but, I am still not 100% clear on how to declear the textbox within the FormView or DataGrid Section.

************************************************** *************
<%@ Page Language="VB" MasterPageFile="~/DefaultMembers.master" AutoEventWireup="false" CodeFile="subCustomer.aspx.vb" Inherits="MemberPages_subCustomer" title="Customer Profile" %>
<asp:Content ID="Content1" ContentPlaceHolderID="Main" Runat="Server">
    <h4>
        Customer Profile<br />
    </h4>

<asp:TextBox ID="txtboxTimeEntry" runat="server" OnTextChanged="txtboxTimeEntry_TextChanged"
        Text='<%# Bind("time_stamp_entry") %>' Visible="False" Width="37px"></asp:TextBox>

<asp:FormView ID="FormView1" runat="server" DataKeyNames="CustomerID" DataSourceID="AccessCustomerProfile"
        DefaultMode="Insert" Width="566px" CellPadding="4" ForeColor="#333333">
         <InsertItemTemplate>


************************************************** ***************
    Protected Sub txtboxTimeEntry_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim dtNow As DateTime = DateTime.Now
        txtboxTimeEntry.Text = dtNow.ToString
    End Sub

First, to answer your original question, when you create a TextBox control inside of a FormView (or repeater, or gridview, etc) you aren't declaring the control in the scope that the page can see.

For example:
<asp:TextBox id="txt" runat="server" />
can be accessed like this:
txt.[property] = "foo"

However when you create a control INSIDE one of the aforementioned controls like this:
<asp:FormView ID="FormView1" runat="server" DataKeyNames="CustomerID" DataSourceID="AccessCustomerProfile"
        DefaultMode="Insert" Width="566px" CellPadding="4" ForeColor="#333333">
         <InsertItemTemplate>
            <asp:TextBox id="txt" runat="server" />
         </InsertItemTemplate>

The control does not exsist UNTIL you have bound data to the control or the particular template is being viewed. This is why you are getting the error that you are because the control doesn't actually exsist.

You need to handle the event that will expose this control to you (I don't use the form view much so I am not sure which event you need to handle) then you can assign it the TextChanged property. Imar or Peter may be able to better guide you on this.



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http://www.catb.org/~esr/faqs/smart-questions.html
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Technical Editor for:
Beginning Visual C# 2008
Professional Search Engine Optimization with ASP.NET
Professional IIS 7 and ASP.NET Integrated Programming
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Thank you DPARSONS for the update.