error implementing simple button_click in ASP,NET

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- I have drag-dropped an ASP button on to a webform. When someone clicks the button, I want it's text property to change.

- This is the HTML for it

HTML

<asp:Button ID="LoginButton" runat="server" Text="Login" OnClick="LoginButton_Click" />

- and this is the vb code behind

VB

Protected Sub LoginButton_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        LoginButton.Text = "123"
    End Sub

- i'm getting the error "Name 'Loginbutton' is not declared'. And this is really funny, cause the intellisense detects it just fine!

- btw this is an ASP.NET web application....the code works just fine on an ASP.NET website.

Posted 29-Apr-10 1:37am

ashwin_nair2011

Updated 29-Apr-10 2:26am

Tony Richards

v2

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4 solutions

Solution 3

thanks...apparently i need to initialize the control....strange that ASP.NET websites (as opposed to web applications) dont require this.

Posted 29-Apr-10 3:12am

ashwin_nair2011

Solution 4

hello,

your query is very simple all u have to do is write the following code in button's click event

VB

Protected Sub LoginButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles LoginButton.Click
       LoginButton.Text = "abc"
   End Sub

I really dont know why its given u error, ur code is also fine
do rate my answer once u find it useful

Thanks & regards
Radix :rose:

Posted 29-Apr-10 20:17pm

radix3

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Tony Richards · Accepted Answer · 2010-04-29T02:25:00

An alternative could be to use the sender property of the event handler. I believe this will have the same effect:

VB

Protected Sub LoginButton_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim button as Button = CType(sender, Button)
    button.Text = "123"
End Sub

If you get in to the habit of this it can make your event handlers easier to reuse, depending on your desired behaviour. This event handler will always change the clicked button's text to 123, regardless of the name of the button. However, you will need to implement the normal checks to make sure that sender actually is a button, otherwise you'll get exceptions thrown.

Disclaimer: I just typed this code as is straight in to here, I haven't tested it and it's been a little while since I used VB, so you might have to sort out syntax errors and incorrect Type names, etc., but hopefully you get the idea.

Jamil Hallal · Accepted Answer · 2010-04-29T02:06:00

Hi,

please try to override oninit event of your page where you are using this button as the follow:

C#:

C#

protected override void OnInit(EventArgs e)
{
    base.OnInit(e);
    btnLoginButton = new Button();
}

VB.NET:

VB

Protected Overloads Overrides Sub OnInit(e As EventArgs)
    MyBase.OnInit(e)
    btnLoginButton = New Button()
End Sub

Regards,
Jamil

check my latest article:
http://www.codeproject.com/Tips/74491/Silverlight-Html-Host-Control.aspx[^]

error implementing simple button_click in ASP,NET

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