Asp.Net how to create seperate event handler for programmatically generated controls

[samsol]

In my asp.net web application, i have created controls programmatically, when i try to get the Id assigned to the current lblId control it returns the last id assigned to lblid control.

The code is given below.

Private Sub LoadProducts(ByVal grpId As Integer)
                    Dim img1 As Integer = 50
            Dim PropertyFromTop As Integer = 130
            Dim PriceFromTop As Integer = 150
            Dim DescFromTop As Integer = 170
            Dim QuantityFromTop As Integer = 190
            Dim linkfromtop As Integer = 210
            Dim IdfromTop As Integer = 210
            Dim imgCount = (From s In db.TblPosts Where s.TblSubCategory2.SubCategory2Id = grpId Select s)
            For Each s In imgCount
                Dim imge1 As Image = New Image()
                Dim l1 As LinkButton = New LinkButton()
                Dim lblProperty As Label = New Label
                Dim lblPrice As Label = New Label
                Dim lblDesc As Label = New Label
                Dim lblQuantity As Label = New Label
                lblId = New Label
                l1.ID = "lnk"
                l1.Style("Position") = "Absolute"
                l1.Style("Top") = linkfromtop.ToString() & "px"
                l1.Style("Left") = "200px"
                l1.ForeColor = Drawing.Color.Blue
                imge1.Style("Position") = "Absolute"
                imge1.Style("Top") = img1.ToString() & "px"
                imge1.Style("Left") = "10px"
                imge1.Width = 180
                imge1.Height = 200
                lblProperty.Style("Position") = "Absolute"
                lblProperty.Style("Top") = PropertyFromTop.ToString() & "px"
                lblProperty.Style("Left") = "200px"
                lblProperty.ForeColor = Drawing.Color.Black
                lblPrice.Style("Position") = "Absolute"
                lblPrice.Style("Top") = PriceFromTop.ToString() & "px"
                lblPrice.Style("Left") = "200px"
                lblPrice.ForeColor = Drawing.Color.Black
                lblDesc.Style("Position") = "Absolute"
                lblDesc.Style("Top") = DescFromTop.ToString() & "px"
                lblDesc.Style("Left") = "200px"
                lblDesc.ForeColor = Drawing.Color.Black
                lblQuantity.Style("Position") = "Absolute"
                lblQuantity.Style("Top") = QuantityFromTop.ToString() & "px"
                lblQuantity.Style("Left") = "200px"
                lblQuantity.ForeColor = Drawing.Color.Black
                lblId.Style("Position") = "Absolute"
                lblId.Style("Top") = IdfromTop.ToString() & "px"
                lblId.Style("Left") = "280px"
                lblId.ForeColor = Drawing.Color.Black
                l1.Text = "Add to Cart"
                lblId.Text = s.PostId
                lblProperty.Text = "Name:  " & s.PropertyName
                lblPrice.Text = "Price:  " & s.Price
                lblDesc.Text = "Description:  " & s.Description
                lblQuantity.Text = "Quantity:  " & s.Quantity
                imge1.ImageUrl = "~/ImageHandler.ashx?Id=" + Convert.ToString(s.PostId)
 
                AddHandler l1.Click, AddressOf Me.LinkButon_Click
                Pnlprofile.Controls.Add(lblId)
                Pnlprofile.Controls.Add(l1)
                Pnlprofile.Controls.Add(imge1)
                Pnlprofile.Controls.Add(lblProperty)
                Pnlprofile.Controls.Add(lblPrice)
                Pnlprofile.Controls.Add(lblDesc)
                Pnlprofile.Controls.Add(lblQuantity)
                img1 = Convert.ToInt32(img1)
                img1 = img1 + 220
                IdfromTop = Convert.ToInt32(IdfromTop)
                IdfromTop = IdfromTop + 220
                linkfromtop = Convert.ToInt32(linkfromtop)
                linkfromtop = linkfromtop + 220
                PropertyFromTop = Convert.ToInt32(PropertyFromTop)
                PropertyFromTop = PropertyFromTop + 220
                PriceFromTop = Convert.ToInt32(PriceFromTop)
                PriceFromTop = PriceFromTop + 220
                DescFromTop = Convert.ToInt32(DescFromTop)
                DescFromTop = DescFromTop + 220
                QuantityFromTop = Convert.ToInt32(QuantityFromTop)
                QuantityFromTop = QuantityFromTop + 220
            Next
 
    End Sub
 
 Private Sub LinkButon_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        MsgBox(lblId.Text)
    End Sub

[iam_clint]

i'm probably a little late here but sender is what you are looking for

  Private Sub LinkButon_Click(ByVal sender As LinkButton, ByVal e As System.EventArgs)
        MsgBox(sender.Text)
    End Sub
 

[Frinavale]

Dynamically added controls are a bit tricky to do in ASP.NET because you have to keep the life cycle in mind when you use them.

Events for controls are created early in the life cycle when the ViewState is loaded. If the controls don't exist during this stage, then the events won't get created and your code will never be executed.


This means that your dynamic controls have to be created during the Page_Init event.

Check out this article about How to use dynamic controls in ASP.NET for more information and a simple example.

I recommend that you avoid using dynamic controls and place the ASP.NET code in the appropriate design file instead. It will be a lot easier for you to design the page, a lot easier for you to use the controls and it will keep your UI code out of your Server/Back-end code (clean)

Also, please note that an VB.NET code that you implement is executed On The Server.

Therefore, the code MsgBox(lblId.Text) will not appear in a browser that is not running on the same computer as the web server.



-Frinny