Why GetUser getting NullReferenceException???

I'm creating my own create user wizard.

Here's my code...
If Membership.GetUser(txtEzUsername.Text).ProviderUserKey.ToString
<> "" Then
Me.lblStatus.Text = "Username is in use. Please select another
Username."
Exit Sub
End If

Here's the error:
System.NullReferenceException was unhandled by user code
Message="Object reference not set to an instance of an object."
Source="App_Web_5nh_bhxb"
StackTrace:
at NewUserWizard.cmdCreate_Click(Object sender, EventArgs e) in
F:\work-related\websites\Lexitel\NewUserWizard.aspx.vb:line 87 at
System.Web.UI.WebControls.Button.OnClick(EventArgs e) at
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
at
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
eventArgument) at
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl,
String eventArgument) at
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint,
Boolean includeStagesAfterAsyncPoint)
InnerException:

How can I check if GetUser returns nothing (ie the user doesnt exist)?

Thanks.

Cowboy
Sat Jul 26 16:17:11 CDT 2008

You are blowing up on this part:

.ProviderUserKey.ToString

You can avoid this by doing this:

Dim user As MembershipUser = Membership.GetUser(txtEzUsername.Text)

If user is nothing then
'There is no user
Else
'Do what you want
End if

--
Gregory A. Beamer
MVP, MCP: +I, SE, SD, DBA

Subscribe to my blog
http://gregorybeamer.spaces.live.com/lists/feed.rss

or just read it:
http://gregorybeamer.spaces.live.com/

********************************************
| Think outside the box! |
********************************************
"Cirene" <cirene@nowhere.com> wrote in message
news:OdkwnO27IHA.2064@TK2MSFTNGP02.phx.gbl...
> I'm creating my own create user wizard.
>
> Here's my code...
> If Membership.GetUser(txtEzUsername.Text).ProviderUserKey.ToString
> <> "" Then
> Me.lblStatus.Text = "Username is in use. Please select another
> Username."
> Exit Sub
> End If
>
> Here's the error:
> System.NullReferenceException was unhandled by user code
> Message="Object reference not set to an instance of an object."
> Source="App_Web_5nh_bhxb"
> StackTrace:
> at NewUserWizard.cmdCreate_Click(Object sender, EventArgs e) in
> F:\work-related\websites\Lexitel\NewUserWizard.aspx.vb:line 87 at
> System.Web.UI.WebControls.Button.OnClick(EventArgs e) at
> System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
> at
> System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
> eventArgument) at
> System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl,
> String eventArgument) at
> System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at
> System.Web.UI.Page.ProcessRequestMain(Boolean
> includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
> InnerException:
>
> How can I check if GetUser returns nothing (ie the user doesnt exist)?
>
> Thanks.
>

Lloyd
Sat Jul 26 16:17:40 CDT 2008

Cirene wrote:
> I'm creating my own create user wizard.
>
> Here's my code...
> If Membership.GetUser(txtEzUsername.Text).ProviderUserKey.ToString
> <> "" Then
> Me.lblStatus.Text = "Username is in use. Please select another
> Username."
> Exit Sub
> End If
>
> Here's the error:
> System.NullReferenceException was unhandled by user code
> Message="Object reference not set to an instance of an object."
> Source="App_Web_5nh_bhxb"
> StackTrace:
> at NewUserWizard.cmdCreate_Click(Object sender, EventArgs e) in
> F:\work-related\websites\Lexitel\NewUserWizard.aspx.vb:line 87 at
> System.Web.UI.WebControls.Button.OnClick(EventArgs e) at
> System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
> at
> System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
> eventArgument) at
> System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl,
> String eventArgument) at
> System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at
> System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint,
> Boolean includeStagesAfterAsyncPoint)
> InnerException:
>
> How can I check if GetUser returns nothing (ie the user doesnt exist)?
>
> Thanks.
>
>


The statement
If Membership.GetUser(txtEzUsername.Text).ProviderUserKey.ToString

expects that a user will be found. The .ProviderUserKey.ToString
expects a user object so you will have to test the
Membership.GetUser(txtEzUsername.Text) for nothing before you attempt to
use the object.

I would suggest a two step statement, the first to attempt to populate a
user object and if it is not nothing then do the .ProviderUserKey etc.

LS

Cirene
Sat Jul 26 16:44:28 CDT 2008

Thanks Cowboy and Lloyd (and everyone else)!

"Cowboy (Gregory A. Beamer)" <NoSpamMgbworld@comcast.netNoSpamM> wrote in
message news:uaFd9T27IHA.5596@TK2MSFTNGP02.phx.gbl...
> You are blowing up on this part:
>
> .ProviderUserKey.ToString
>
> You can avoid this by doing this:
>
> Dim user As MembershipUser = Membership.GetUser(txtEzUsername.Text)
>
> If user is nothing then
> 'There is no user
> Else
> 'Do what you want
> End if
>
> --
> Gregory A. Beamer
> MVP, MCP: +I, SE, SD, DBA
>
> Subscribe to my blog
> http://gregorybeamer.spaces.live.com/lists/feed.rss
>
> or just read it:
> http://gregorybeamer.spaces.live.com/
>
> ********************************************
> | Think outside the box! |
> ********************************************
> "Cirene" <cirene@nowhere.com> wrote in message
> news:OdkwnO27IHA.2064@TK2MSFTNGP02.phx.gbl...
>> I'm creating my own create user wizard.
>>
>> Here's my code...
>> If Membership.GetUser(txtEzUsername.Text).ProviderUserKey.ToString
>> <> "" Then
>> Me.lblStatus.Text = "Username is in use. Please select another
>> Username."
>> Exit Sub
>> End If
>>
>> Here's the error:
>> System.NullReferenceException was unhandled by user code
>> Message="Object reference not set to an instance of an object."
>> Source="App_Web_5nh_bhxb"
>> StackTrace:
>> at NewUserWizard.cmdCreate_Click(Object sender, EventArgs e) in
>> F:\work-related\websites\Lexitel\NewUserWizard.aspx.vb:line 87 at
>> System.Web.UI.WebControls.Button.OnClick(EventArgs e) at
>> System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
>> at
>> System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
>> eventArgument) at
>> System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
>> sourceControl, String eventArgument) at
>> System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at
>> System.Web.UI.Page.ProcessRequestMain(Boolean
>> includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
>> InnerException:
>>
>> How can I check if GetUser returns nothing (ie the user doesnt exist)?
>>
>> Thanks.
>>
>