form id, this.Controls ... ?

[Arman Sahakyan]

Hi,

While writing code for creating aspx controls dynamically, I noticed some
strange (at least to me) behavior.
Look at this code;

// FreeQuery : System.Web.UI.P age
// void cmdDo_Click(... )

GridView grid = new GridView();
grid.DataSource = source;
this.Controls.A dd(grid); // HERE

The last line fails during execution!
But if I type like so;

//...
form1.Controls. Add(grid);

.... where form1 is generated in FreeQuery.aspx file;

....
<form id="form1" runat="server">
....

no failure will happen.

-------------------------
So what happens?
Why does this.Controls.A dd fail?
What's the difference between this and form1?
....

Could you please share your knowledge with us.

Thanks in advance.


--
======
Arman

[Michael Nemtsev]

Re: form id, this.Controls ... ?

Hello Arman,

Because "this" has the type of "ASP._Defau lt" and not of your form

ASHi,
AS>
ASWhile writing code for creating aspx controls dynamically, I noticed
ASsome
ASstrange (at least to me) behavior.
ASLook at this code;
AS// FreeQuery : System.Web.UI.P age
AS// void cmdDo_Click(... )
ASGridView grid = new GridView();
ASgrid.DataSour ce = source;
ASthis.Controls .Add(grid); // HERE
ASThe last line fails during execution!
ASBut if I type like so;
AS//...
ASform1.Control s.Add(grid);
AS... where form1 is generated in FreeQuery.aspx file;
AS>
AS...
AS<form id="form1" runat="server">
AS...
ASno failure will happen.
AS>
AS-------------------------
ASSo what happens?
ASWhy does this.Controls.A dd fail?
ASWhat's the difference between this and form1?
AS...
ASCould you please share your knowledge with us.
AS>
ASThanks in advance.
AS>
---
WBR,
Michael Nemtsev :: blog: http://spaces.live.com/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche

[Michael Nemtsev]

Re: form id, this.Controls ... ?

Hello Michael ,

"ASP.<yourFormN ame_aspx>"

mistyped first time

MNHello Arman,
MN>
MNBecause "this" has the type of "ASP._Defau lt" and not of your form
MN>
AS>Hi,
AS>>
AS>While writing code for creating aspx controls dynamically, I
AS>noticed
AS>some
AS>strange (at least to me) behavior.
AS>Look at this code;
AS>// FreeQuery : System.Web.UI.P age
AS>// void cmdDo_Click(... )
AS>GridView grid = new GridView();
AS>grid.DataSou rce = source;
AS>this.Control s.Add(grid); // HERE
AS>The last line fails during execution!
AS>But if I type like so;
AS>//...
AS>form1.Contro ls.Add(grid);
AS>... where form1 is generated in FreeQuery.aspx file;
AS>...
AS><form id="form1" runat="server">
AS>...
AS>no failure will happen.
AS>-------------------------
AS>So what happens?
AS>Why does this.Controls.A dd fail?
AS>What's the difference between this and form1?
AS>...
AS>Could you please share your knowledge with us.
AS>Thanks in advance.
AS>>
MN---
MNWBR,
MNMichael Nemtsev :: blog: http://spaces.live.com/laflour
MN"At times one remains faithful to a cause only because its opponents
MNdo not cease to be insipid." (c) Friedrich Nietzsche
MN>
---
WBR,
Michael Nemtsev :: blog: http://spaces.live.com/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche