Dynamically Creating Textbox - Object Reference Not Set to an Inst

Collapse
This topic is closed.
X
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • =?Utf-8?B?a2VubnltY2U=?=
    #1

    Dynamically Creating Textbox - Object Reference Not Set to an Inst

    Hi,

    I'm probably being somewhat dim here and missing something obvious, but I'm
    trying to dynamically create a text box and then retrieve its value after
    postback.

    Partial Public Class _Default
    Inherits System.Web.UI.P age

    Private Sub Page_Init(ByVal sender As Object, ByVal e As
    System.EventArg s) Handles Me.Init
    Dim txtTest As New TextBox
    PlaceHolder1.Co ntrols.Add(txtT est)

    End Sub

    Private Sub Button1_Click(B yVal sender As Object, ByVal e As
    System.EventArg s) Handles Button1.Click

    Dim myTextBox As TextBox
    myTextBox = PlaceHolder1.Fi ndControl("txtT est")
    Response.Write( "Value for dynamic textbox = " & myTextBox.Text)

    End Sub
    End Class

    I'm getting an "Object Reference Not Set to an Instance" error on the line:

    Response.Write( "Value for dynamic textbox = " & myTextBox.Text)

    It seems that the FindControl function isn't able to find my textbox.

    Please can somebody help?

    Thanks in advance,

    --
    Kenny.
    Systems Developer
    Tags: None
    • nick chan
      #2
      Re: Dynamically Creating Textbox - Object Reference Not Set to anInst

      Dim txtTest As New TextBox
      txtText.ID = "txtTest"

      kennymce wrote:
      Hi,
      >
      I'm probably being somewhat dim here and missing something obvious, but I'm
      trying to dynamically create a text box and then retrieve its value after
      postback.
      >
      Partial Public Class _Default
      Inherits System.Web.UI.P age
      >
      Private Sub Page_Init(ByVal sender As Object, ByVal e As
      System.EventArg s) Handles Me.Init
      Dim txtTest As New TextBox
      PlaceHolder1.Co ntrols.Add(txtT est)
      >
      End Sub
      >
      Private Sub Button1_Click(B yVal sender As Object, ByVal e As
      System.EventArg s) Handles Button1.Click
      >
      Dim myTextBox As TextBox
      myTextBox = PlaceHolder1.Fi ndControl("txtT est")
      Response.Write( "Value for dynamic textbox = " & myTextBox.Text)
      >
      End Sub
      End Class
      >
      I'm getting an "Object Reference Not Set to an Instance" error on the line:
      >
      Response.Write( "Value for dynamic textbox = " & myTextBox.Text)
      >
      It seems that the FindControl function isn't able to find my textbox.
      >
      Please can somebody help?
      >
      Thanks in advance,
      >
      --
      Kenny.
      Systems Developer

        Comment

        • =?Utf-8?B?a2VubnltY2U=?=
          #3
          Re: Dynamically Creating Textbox - Object Reference Not Set to an

          Thank you, Mr Chan. Sorted.
          --
          Kenny.
          Systems Developer


          "nick chan" wrote:
          Dim txtTest As New TextBox
          txtText.ID = "txtTest"
          >
          kennymce wrote:
          Hi,

          I'm probably being somewhat dim here and missing something obvious, but I'm
          trying to dynamically create a text box and then retrieve its value after
          postback.

          Partial Public Class _Default
          Inherits System.Web.UI.P age

          Private Sub Page_Init(ByVal sender As Object, ByVal e As
          System.EventArg s) Handles Me.Init
          Dim txtTest As New TextBox
          PlaceHolder1.Co ntrols.Add(txtT est)

          End Sub

          Private Sub Button1_Click(B yVal sender As Object, ByVal e As
          System.EventArg s) Handles Button1.Click

          Dim myTextBox As TextBox
          myTextBox = PlaceHolder1.Fi ndControl("txtT est")
          Response.Write( "Value for dynamic textbox = " & myTextBox.Text)

          End Sub
          End Class

          I'm getting an "Object Reference Not Set to an Instance" error on the line:

          Response.Write( "Value for dynamic textbox = " & myTextBox.Text)

          It seems that the FindControl function isn't able to find my textbox.

          Please can somebody help?

          Thanks in advance,

          --
          Kenny.
          Systems Developer
          >

            Comment

            • nick chan
              #4
              Re: Dynamically Creating Textbox - Object Reference Not Set to anInst

              if im not mistaken, you can also do this

              Dim txtTest As New TextBox
                  Private Sub Page_Init(ByVal sender As Object, ByVal e As
              System.EventArg s) Handles Me.Init
                     
                      PlaceHolder1.Co ntrols.Add(txtT est)

                  End Sub


                  Private Sub Button1_Click(B yVal sender As Object, ByVal e As
              System.EventArg s) Handles Button1.Click

                      Response.Write( "Value for dynamic textbox = " & txtTest.Text)

                  End Sub



              On Jul 2, 3:46 pm, kennymce <kenny...@discu ssions.microsof t.com>
              wrote:
              Hi,
              >
              I'm probably being somewhat dim here and missing something obvious, but I'm
              trying to dynamically create a text box and then retrieve its value after
              postback.
              >
              Partial Public Class _Default
                  Inherits System.Web.UI.P age
              >
                  Private Sub Page_Init(ByVal sender As Object, ByVal e As
              System.EventArg s) Handles Me.Init
                      Dim txtTest As New TextBox
                      PlaceHolder1.Co ntrols.Add(txtT est)
              >
                  End Sub
              >
                  Private Sub Button1_Click(B yVal sender As Object, ByVal e As
              System.EventArg s) Handles Button1.Click
              >
                      Dim myTextBox As TextBox
                      myTextBox = PlaceHolder1.Fi ndControl("txtT est")
                      Response.Write( "Value for dynamic textbox = " & myTextBox.Text)
              >
                  End Sub
              End Class
              >
              I'm getting an "Object Reference Not Set to an Instance" error on the line:
              >
              Response.Write( "Value for dynamic textbox = " & myTextBox.Text)
              >
              It seems that the FindControl function isn't able to find my textbox.
              >
              Please can somebody help?
              >
              Thanks in advance,
              >
              --
              Kenny.
              Systems Developer

                Comment

                Previous template Next
                Working...