DataGrid Mystery

[GaryDean]

I have a situation where characters are somehow getting stripped from a
textbox in an ItemTemplate in a cell of a DataGrid.

In the itemDataBound event I am moving data from columns created at run time
into other columns, created at design time, I have set up with Textboxes.
This program has ran correctly for months until this recent condition.

I have come upon the situation where a nvarchar field in a SQLServer table
has a carriage return character in it - a hex 0D. After the following two
lines of code are executed in the ItemDataBound event.....

Dim mytb As TextBox = CType(e.Item.Cells(t + 1).Controls(1), TextBox)
mytb.Text = e.Item.Cells(t + dg.Columns.Count).Text

mytb.Text correctly has received the string complete with the "0D" character
intact. However, when the grid is diplayed and later posted back, the "0D"
character is gone from the string. My program then makes an incorrect
assumption that the user modified the value in the textbox.

How and why is this 0D character getting stripped from the textbox?

 

[Walter Wang [MSFT]]

Hi Gary,

For multiline text content, I think you need to use a textarea (set
TextMode="Multiline") instead of a simple input.

You can verify this behavior by using following simple WebForm:

<form id="form1" runat="server">
<div>
<asp:TextBox ID="text1" runat="server"></asp:TextBox>
<asp:textbox ID="text2" runat="server"
TextMode="multiLine"></asp:textbox>
<asp:button id="button1" runat="server" text="button1"
OnClick="button1_Click"></asp:button>
<asp:Button ID="button2" runat="server" Text="button2"
OnClick="button2_Click" />
</div>
</form>

Code-behind:

protected void button1_Click(object sender, EventArgs e)
{
text1.Text = "hello\rworld";
text2.Text = "hello\rworld";
}
protected void button2_Click(object sender, EventArgs e)
{
Response.Write("Carriage Return in text1: " +
text1.Text.IndexOf('\r') + "<br>");
Response.Write("Carriage Return in text2: " +
text2.Text.IndexOf('\r') + "<br>");
}

Text2 retains the Carriage Return because its TextMode set to "Multiline".

I hope this helps. Please feel free to post here if anything is unclear.

Sincerely,
Walter Wang ([email protected], remove 'online.')
Microsoft Online Community Support

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications. If you are using Outlook Express, please make sure you clear the
check box "Tools/Options/Read: Get 300 headers at a time" to see your reply
promptly.

Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
where an initial response from the community or a Microsoft Support
Engineer within 1 business day is acceptable. Please note that each follow
up response may take approximately 2 business days as the support
professional working with you may need further investigation to reach the
most efficient resolution. The offering is not appropriate for situations
that require urgent, real-time or phone-based interactions or complex
project analysis and dump analysis issues. Issues of this nature are best
handled working with a dedicated Microsoft Support Engineer by contacting
Microsoft Customer Support Services (CSS) at
http://msdn.microsoft.com/subscriptions/support/default.aspx.
==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.

 

[GaryDean]

Walter,
Yes. That solves my "mystery." It is stripping carriage returns and line
feeds probably. I wonder if it strips anything else.

-
Regards,
Gary Blakely

 

[Walter Wang [MSFT]]

Gary,

So far I've tested that \r and \n get striped, \t works ok. I think any
other non-print characters will also be striped. This issue is not ASP.NET
related, it's by design behavior of html form input fields.

Regards,
Walter Wang ([email protected], remove 'online.')
Microsoft Online Community Support

==================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.