Should this be a bug or not - ASP.NET Request parameter - asp.net

Question

I posted a number of bugs on Microsoft site and while they were real bugs, MSFT will close it as design [And I figured most people favour MSFT anyways]. Here is one that I am sure they will clasify as by design but to me this is a serious bug.
This is all I have in ASPX page (NET 3.5).
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Submit" /><br />
<asp:Label ID="lblOutput" runat="server" Text="Label"></asp:Label>
Codebehind
protected void Page_Load(object sender, EventArgs e)
{ /* this works */
if (IsPostBack)
{
string txt = string.Empty;
txt = Request.Params["TextBox1"];
lblOutput.Text = "You entered : " + txt;
}
}
protected void Button1_Click(object sender, EventArgs e)
{ /* this does not */
string txt = string.Empty;
txt = Request.Params["TextBox1"];
lblOutput.Text = "You entered : " + txt;
}
Now if you include another simple HTML textbox (Not ASP) like this
<input type="text" id="mytextbox" name="mytextbox" /> // still it below the existing one
txt = Request.Params["mytextbox"]; // change to this line instead of TextBox1
Then it works in both places.

Answer 1

protected void Button1_Click(object sender, EventArgs e)
{ /* Now this works which is weird but it does */
If(IsPostback)
{
string txt = string.Empty;
txt = Request.Params["TextBox1"];
lblOutput.Text = "You entered : " + txt;
}
}
I therefore should close the question.

Answer 2

If you are forced to use the Request object instead normal asp:* controls, use it like this:
txt = Request["TextBox1"];
It will check all the HttpRequest collections.
The QueryString, Form, Cookies, or ServerVariables collection member
specified in the key parameter. If the specified key is not found,
then null is returned.

Answer 3

That is really fundamental stuff you're doing in that example, so I highly doubt it's a bug. From the example, it looks like you're going against the grain:
Markup
<asp:PlaceHolder ID="PlaceHolder1" runat="server">
<asp:TextBox ID="TextBox1" runat="server" />
<asp:TextBox ID="TextBox2" runat="server" />
<asp:TextBox ID="TextBox3" runat="server" />
<asp:TextBox ID="TextBox4" runat="server" />
...
</asp:PlaceHolder>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" /><br />
<asp:Label ID="lblOutput" runat="server" Text="Label"></asp:Label>
Code-behind
protected void Button1_Click(object sender, EventArgs e)
{
foreach (TextBox txtCtrl in PlaceHolder1.Controls.OfType<TextBox>())
{
//append the textbox value to the label
lblOutput.Text += String.Format("{0}<br/>", txtCtrl.Text);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
List<TextBox> txtList = PlaceHolder1.Controls.OfType<TextBox>().ToList();
for (int ctrlIndex = 0; ctrlIndex < txtList.Count; ctrlIndex++)
{
TextBox txtCtrl = txtList.ElementAt(ctrlIndex);
if (txtCtrl != null)
{
lblOutput.Text += String.Format("{0}<br/>", txtCtrl.Text);
}
}
}