how to reach linkbutton programmatically?

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  • Ben
    #1

    how to reach linkbutton programmatically?

    Hi,

    i try to reach in code-behind a linkbutton embedded into an ItemTemplate
    element of a gridview.
    But i'm stuck ....

    <Columns>
    <asp:TemplateFi eld><ItemTempla te>
    <asp:LinkButt on ID="lb1" runat="server" OnClientClick=" return
    confirm(Sure?') ;"
    CommandName="De lete" Text="go" >
    </asp:LinkButton>
    </ItemTemplate></asp:TemplateFie ld>
    ....

    my code:
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As
    System.EventArg s) Handles Me.Load
    Dim tm As TemplateField
    Dim it As ITemplate
    Dim lk As LinkButton
    tm = GridView1.Colum ns.Item(0)
    it = tm.ItemTemplate
    lk=???

    Thanks for help
    Ben


    Tags: None
    • Teemu Keiski
      #2
      Re: how to reach linkbutton programmaticall y?

      Hi,

      see my blog post for background information

      Understanding the naming container hierarchy of ASP.NET databound controls
      http://aspadvice.com/blogs/joteke/archive/2007/02/25/Understanding-the-naming-container-hierarchy-of-ASP.NET-databound-controls.aspx


      Answer is that you need to loop through GridView's Rows, use FindControl
      against the row to locate the LinkButton. that is if you need to access them
      after they are (the grid is) being bound.

      However if you need to do something like attach event handler to the
      LinkButton, you can (and you should) do it in RowCreated event of GridView
      which is raised for every row, when they are created (instantiated). And if
      you need to set something based o the data to which GridView is bound, you'd
      use RowDataBound event which also is raised for every row but only when
      GridView's DataBind is called.

      --
      Teemu Keiski
      AspInsider, ASP.NET MVP
      http://blogs.aspadvice.com/joteke

      http://teemukeiski.net


      "Ben" <ben@sdcsazwrot e in message
      news:eWEh8nd3HH A.1204@TK2MSFTN GP03.phx.gbl...
      Hi,
      >
      i try to reach in code-behind a linkbutton embedded into an ItemTemplate
      element of a gridview.
      But i'm stuck ....
      >
      <Columns>
      <asp:TemplateFi eld><ItemTempla te>
      <asp:LinkButt on ID="lb1" runat="server" OnClientClick=" return
      confirm(Sure?') ;"
      CommandName="De lete" Text="go" >
      </asp:LinkButton>
      </ItemTemplate></asp:TemplateFie ld>
      ...
      >
      my code:
      Protected Sub Page_Load(ByVal sender As Object, ByVal e As
      System.EventArg s) Handles Me.Load
      Dim tm As TemplateField
      Dim it As ITemplate
      Dim lk As LinkButton
      tm = GridView1.Colum ns.Item(0)
      it = tm.ItemTemplate
      lk=???
      >
      Thanks for help
      Ben
      >

        Comment

        • Ben
          #3
          Re: how to reach linkbutton programmaticall y?

          Thanks for replying

          This is my attempt:

          Dim lk As LinkButton
          Dim gr As GridViewRow
          For Each gr In GridView1.Colum ns
          lk = CType(gr.FindCo ntrol("lb1"), LinkButton)
          lk.Visible = False
          Next

          But i get: Unable to cast object of type
          'System.Web.UI. WebControls.Tem plateField' to type
          'System.Web.UI. WebControls.Gri dViewRow'




          "Teemu Keiski" <joteke@aspalli ance.comschreef in bericht
          news:%23N909sd3 HHA.4672@TK2MSF TNGP05.phx.gbl. ..
          Hi,
          >
          see my blog post for background information
          >
          Understanding the naming container hierarchy of ASP.NET databound controls
          http://aspadvice.com/blogs/joteke/archive/2007/02/25/Understanding-the-naming-container-hierarchy-of-ASP.NET-databound-controls.aspx

          >
          Answer is that you need to loop through GridView's Rows, use FindControl
          against the row to locate the LinkButton. that is if you need to access
          them after they are (the grid is) being bound.
          >
          However if you need to do something like attach event handler to the
          LinkButton, you can (and you should) do it in RowCreated event of GridView
          which is raised for every row, when they are created (instantiated). And
          if you need to set something based o the data to which GridView is bound,
          you'd use RowDataBound event which also is raised for every row but only
          when GridView's DataBind is called.
          >
          --
          Teemu Keiski
          AspInsider, ASP.NET MVP
          http://blogs.aspadvice.com/joteke

          http://teemukeiski.net

          >
          "Ben" <ben@sdcsazwrot e in message
          news:eWEh8nd3HH A.1204@TK2MSFTN GP03.phx.gbl...
          >Hi,
          >>
          >i try to reach in code-behind a linkbutton embedded into an ItemTemplate
          >element of a gridview.
          >But i'm stuck ....
          >>
          ><Columns>
          ><asp:TemplateF ield><ItemTempl ate>
          ><asp:LinkButto n ID="lb1" runat="server" OnClientClick=" return
          >confirm(Sure?' );"
          > CommandName="De lete" Text="go" >
          > </asp:LinkButton>
          ></ItemTemplate></asp:TemplateFie ld>
          >...
          >>
          >my code:
          >Protected Sub Page_Load(ByVal sender As Object, ByVal e As
          >System.EventAr gs) Handles Me.Load
          > Dim tm As TemplateField
          > Dim it As ITemplate
          > Dim lk As LinkButton
          > tm = GridView1.Colum ns.Item(0)
          > it = tm.ItemTemplate
          > lk=???
          >>
          >Thanks for help
          >Ben
          >>
          >
          >

            Comment

            • Ben
              #4
              Re: how to reach linkbutton programmaticall y?

              i found it:

              For Each gr In GridView1.Rows







              "Teemu Keiski" <joteke@aspalli ance.comschreef in bericht
              news:%23N909sd3 HHA.4672@TK2MSF TNGP05.phx.gbl. ..
              Hi,
              >
              see my blog post for background information
              >
              Understanding the naming container hierarchy of ASP.NET databound controls
              http://aspadvice.com/blogs/joteke/archive/2007/02/25/Understanding-the-naming-container-hierarchy-of-ASP.NET-databound-controls.aspx

              >
              Answer is that you need to loop through GridView's Rows, use FindControl
              against the row to locate the LinkButton. that is if you need to access
              them after they are (the grid is) being bound.
              >
              However if you need to do something like attach event handler to the
              LinkButton, you can (and you should) do it in RowCreated event of GridView
              which is raised for every row, when they are created (instantiated). And
              if you need to set something based o the data to which GridView is bound,
              you'd use RowDataBound event which also is raised for every row but only
              when GridView's DataBind is called.
              >
              --
              Teemu Keiski
              AspInsider, ASP.NET MVP
              http://blogs.aspadvice.com/joteke

              http://teemukeiski.net

              >
              "Ben" <ben@sdcsazwrot e in message
              news:eWEh8nd3HH A.1204@TK2MSFTN GP03.phx.gbl...
              >Hi,
              >>
              >i try to reach in code-behind a linkbutton embedded into an ItemTemplate
              >element of a gridview.
              >But i'm stuck ....
              >>
              ><Columns>
              ><asp:TemplateF ield><ItemTempl ate>
              ><asp:LinkButto n ID="lb1" runat="server" OnClientClick=" return
              >confirm(Sure?' );"
              > CommandName="De lete" Text="go" >
              > </asp:LinkButton>
              ></ItemTemplate></asp:TemplateFie ld>
              >...
              >>
              >my code:
              >Protected Sub Page_Load(ByVal sender As Object, ByVal e As
              >System.EventAr gs) Handles Me.Load
              > Dim tm As TemplateField
              > Dim it As ITemplate
              > Dim lk As LinkButton
              > tm = GridView1.Colum ns.Item(0)
              > it = tm.ItemTemplate
              > lk=???
              >>
              >Thanks for help
              >Ben
              >>
              >
              >

                Comment

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