how do i use a veriable as a textbox name

how do i use a veriable as a textbox name

• DutchChick1234

  you can use this function to find the control by using its name.

  Private Function getControlFromName(ByVal controlName As String) As System.Windows.Forms.Control

  For Each ctl As Control In Me.Controls

  If String.Compare(ctl.Name, controlName, True) = 0 Then

  Return ctl

  End If

  Next ctl

  Return Nothing

  End Function

  call this function as

  Dim txt as TextBox

  txt = getControlFromName("xyz")

  
  
  

• sticksnap

  Actually i am using .net v 1.1 and and i cannot the ref to the control by using

  Me.Controls(controlname)

  i donot know what is in v 2.0

  here in v1.1 the Me.Controls(int) takes the parameter as index as int.

  so i have written the above function to find the control.

  
  
  

• SchallerJe

  If you simply passing in the name of the control. The following shows an example where I pass in a string which is the name of the control I wish to update the text property with. This example should give you what you need.

  Public Class Form1

  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  foo("textbox1", "contents")
  End Sub

  
  Sub foo(ByVal x As String, ByVal content As String)
  Me.Controls(x).Text = content
  End Sub

  End Class

  
  

• ctzseng

  Hi, in your code the function cal() is outside the from, then how should it get the reference of Form1. you have to pass the reference of the form1. to the function.
  
  

• Jesús López

  I am trying to it the first way and i am getting a error

  Object reference not set to an instance of an object.

  on the line

  t1 = Form1.Controls(n2).Text

  i am passing n1, n2 ,3 from the public sub casess

  Public Sub Cal(ByVal n1 As String, ByVal n2 As String, ByVal n3 As String)

  Dim t1, t2 As String

  Dim s1, s2 As Int64

  Dim tot, m1, m2, r1 As Decimal

  t1 = Form1.Controls(n2).Text

  t2 = Form1.Controls(n2).Text

  s1 = Form1.TextBox19.Text

  s2 = Form1.TextBox20.Text

  
  

• SValentine

  If your trying to return the control for a given name why not simply do

  Private Function getControlFromName(ByVal controlName As String) As System.Windows.Forms.Control
  Return Me.Controls(controlName)
  End Function
  

  
  

• Ekart Laszlo

  VS express edition

  yes

  Public Class Form1

  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

  AddStreams()

  End Sub

  end class

  Module Module1

  Public Sub AddStreams()

  WeightorPercentage()

  End Sub

  Public Sub WeightorPercentage()

  boxs()

  End Sub

  Public Sub boxs()

  Casess(nu)

  End Sub

  Public Sub Casess(ByVal nu)

  Dim n1, n2, n3 As String

  Select Case (nu)

  Case 0

  n1 = Form1.S631.Name

  n2 = Form1.S632.Name

  n3 = ""

  Cal(n1, n2, n3)

  Case 1

  n1 = Form1.S501.Name

  n2 = Form1.S502.Name

  n3 = Form1.S631.Name

  Cal(n1, n2, n3)

  end sub

  Public Sub Cal(ByVal n1 As String, ByVal n2 As String, ByVal n3 As String)

  Dim t1, t2 As String

  Dim s1, s2 As Int64

  Dim tot, m1, m2, r1 As Decimal

  t1 = Form1.Controls(n1).Text

  t2 = Form1.Controls(n2).Text

  And this is where thge error occurs

  form 1 dose contain the textboxs

  
  

• ejstembler

  VS express edition

  yes

  Public Class Form1

  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

  AddStreams()

  End Sub

  end class

  Module Module1

  Public Sub AddStreams()

  WeightorPercentage()

  End Sub

  Public Sub WeightorPercentage()

  boxs()

  End Sub

  Public Sub boxs()

  Casess(nu)

  End Sub

  Public Sub Casess(ByVal nu)

  Dim n1, n2, n3 As String

  Select Case (nu)

  Case 0

  n1 = Form1.S631.Name

  n2 = Form1.S632.Name

  n3 = ""

  Cal(n1, n2, n3)

  Case 1

  n1 = Form1.S501.Name

  n2 = Form1.S502.Name

  n3 = Form1.S631.Name

  Cal(n1, n2, n3)

  end sub

  Public Sub Cal(ByVal n1 As String, ByVal n2 As String, ByVal n3 As String)

  Dim t1, t2 As String

  Dim s1, s2 As Int64

  Dim tot, m1, m2, r1 As Decimal

  t1 = Form1.Controls(n1).Text

  t2 = Form1.Controls(n2).Text

  And this is where thge error occurs

  form 1 dose contain the textboxs

  
  

• David S. Anderson

  Which version of the product are you using

  Are you sure that the that controls you are passing exist on the form.

  Is Form1 the class name or an instance of the class (ie. an Object)

  My though would be that Form1 is a class and you havent create and instance and are trying to refer to the class.

  
  

• bxchan

  I am trying to it the first way and i am getting a error

  Object reference not set to an instance of an object.

  on the line

  t1 = Form1.Controls(n2).Text

  i am passing n1, n2 ,3 from the public sub casess

  Public Sub Cal(ByVal n1 As String, ByVal n2 As String, ByVal n3 As String)

  Dim t1, t2 As String

  Dim s1, s2 As Int64

  Dim tot, m1, m2, r1 As Decimal

  t1 = Form1.Controls(n2).Text

  t2 = Form1.Controls(n2).Text

  s1 = Form1.TextBox19.Text

  s2 = Form1.TextBox20.Text

  
  
• how do i use a veriable as a textbox name