How do you check to see if object exists before accessing it?
For example, I may have an object that I make visible and invisible and I
need to make sure it exists as I am putting this code in a User Control.
UserLoggedOn.visible = true
If this doesn't exists, I get an error.
So how do I test for the object (vb.net and C#) before doing this code?
Thanks,
Tom
7  4264 
Try:
if(Page.FindControl("myobjectid")!=null) // It's there
tshad wrote:
How do you check to see if object exists before accessing it?
For example, I may have an object that I make visible and invisible and I
need to make sure it exists as I am putting this code in a User Control.
UserLoggedOn.visible = true
If this doesn't exists, I get an error.
So how do I test for the object (vb.net and C#) before doing this code?
Thanks,
Tom
If(UserLoggedOn != null){
UserLoggedOn.visible = true;
}
"tshad" wrote:
How do you check to see if object exists before accessing it?
For example, I may have an object that I make visible and invisible and I
need to make sure it exists as I am putting this code in a User Control.
UserLoggedOn.visible = true
If this doesn't exists, I get an error.
So how do I test for the object (vb.net and C#) before doing this code?
Thanks,
Tom
<mi*******@hotmail.comwrote in message
news:11**********************@i3g2000cwc.googlegro ups.com...
Try:
if(Page.FindControl("myobjectid")!=null) // It's there
William mentions:
If(UserLoggedOn != null){
UserLoggedOn.visible = true;
}
Which is better or is it 6 of one...?
Thanks,
Tom
>
tshad wrote:
>How do you check to see if object exists before accessing it?
For example, I may have an object that I make visible and invisible and I
need to make sure it exists as I am putting this code in a User Control.
UserLoggedOn.visible = true
If this doesn't exists, I get an error.
So how do I test for the object (vb.net and C#) before doing this code?
Thanks,
Tom
Agreed...
William Sullivan wrote:
If(UserLoggedOn != null){
UserLoggedOn.visible = true;
}
"tshad" wrote:
How do you check to see if object exists before accessing it?
For example, I may have an object that I make visible and invisible and I
need to make sure it exists as I am putting this code in a User Control.
UserLoggedOn.visible = true
If this doesn't exists, I get an error.
So how do I test for the object (vb.net and C#) before doing this code?
Thanks,
Tom
Well, I say that... unless you have a direct reference to the object,
you will need to do the FindControl. If it's directly accessible by
programmatic means, you wouldn't have to.
michae...@hotmail.com wrote:
Agreed...
William Sullivan wrote:
If(UserLoggedOn != null){
UserLoggedOn.visible = true;
}
"tshad" wrote:
How do you check to see if object exists before accessing it?
>
For example, I may have an object that I make visible and invisible and I
need to make sure it exists as I am putting this code in a User Control.
>
UserLoggedOn.visible = true
>
If this doesn't exists, I get an error.
>
So how do I test for the object (vb.net and C#) before doing this code?
>
Thanks,
>
Tom
>
>
>
if (UserLoggedOn != null) UserLoggedOn.visible = true;
-- bruce (sqlwork.com)
"tshad" <ts**********@ftsolutions.comwrote in message
news:u4**************@TK2MSFTNGP06.phx.gbl...
How do you check to see if object exists before accessing it?
For example, I may have an object that I make visible and invisible and I
need to make sure it exists as I am putting this code in a User Control.
UserLoggedOn.visible = true
If this doesn't exists, I get an error.
So how do I test for the object (vb.net and C#) before doing this code?
Thanks,
Tom
Try:
if(Page.FindControl("myobjectid")!=null) // It's there
Not always: if "myobjectid" is a "grandchild" (child of another control
on the page) or deeper, then FindControl will not find it as it
searches only through the direct children.
Hans Kesting
>
tshad wrote:
>How do you check to see if object exists before accessing it?
For example, I may have an object that I make visible and invisible and I
need to make sure it exists as I am putting this code in a User Control.
UserLoggedOn.visible = true
If this doesn't exists, I get an error.
So how do I test for the object (vb.net and C#) before doing this code?
Thanks,
Tom
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