Question

I’m adding in asp.net (vb) an attribute to an image-button:

imgButton.Attributes.Add("myAttr", "true")

This is working fine.

Now i want to read the attribute, but it does not work:

If imgButton.Attributes("myAttr") = "true" Then
 ..doSomething..

How do I get this thing working?

Edit

I have an asp.net repeater.
In this repeater i have in each itemtemplate two image buttons.
If I’m clicking on an imagebutton, the other imagebutton in this row changes it’s URL.
I want that this URL is saved, after clicking on another row’s imagebutton.

So I’m adding in the repeater event
ItemCommand

Dim imgButton As ImageButton

    If e.CommandName = "imgBtn1" Then

        imgButton = CType(e.Item.FindControl("imgBtn1"), ImageButton)
        imgButton.ImageUrl = "myURL"
        imgButton.Attributes.Add("myAttr1", "true")

    ElseIf e.CommandName = "imgBtn2" Then

        imgButton = CType(e.Item.FindControl("imgBtn2"), ImageButton)
        imgButton.ImageUrl = "myURL"
        imgButton.Attributes.Add("myAttr2", "true")

    End If

In the Page Load event I’m adding:

If Page.IsPostBack Then
        Dim countRepeaterItems As Integer = myRepeater.Items.Count
        Dim imgButton As ImageButton

        For i As Integer = 0 To countRepeaterItems - 1
            imgButton = CType(myRepeater.Items(i).FindControl("imgBtn1"), ImageButton)
            If imgButton.Attributes.Item("myAttr1") = "true" Then
                imgButton.ImageUrl = "myURL"
            End If
            imgButton = CType(myRepeater.Items(i).FindControl("imgBtn2"), ImageButton)
            If imgButton.Attributes.Item("myAttr2") = "true" Then
                imgButton.ImageUrl = "myURL"
            End If
        Next

    End If

While debugging, it still skips everything, because all Attributes are empty (but actually they are not)!

Answer 1

I guess! May be you have (turn off the viewstate) set EnableViewState=False to the imgButton.

Take a look at this sample:

Markup:

<form id="form1" runat="server">
    <asp:Button ID="Button1" runat="server" Text="Button" />
    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</form>

Code:

     Protected Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click
        If Label1.Attributes("myAttr") = "true" Then
            Label1.Attributes.Add("myAttr", "false")
            Label1.Text = "false is set"
        Else
            Label1.Attributes.Add("myAttr", "true")
            Label1.Text = "true is set"
        End If
    End Sub
    Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            Label1.Attributes.Add("myAttr", "true")
        End If
    End Sub

EDIT:

May be typo in ItemCommand event code.

imgButton.ImageUrl = "myURL"
 imgButton.Attributes.Add("myAttr1", "true") '<----- Correction