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How to Get the Length of the String Using Class Library

Author: DevASP
Download Source Code : 326_StringLength.zip

This sample program will brief you how you can get the length of the string by calling a VB6 Len function through Class Library object in your Project.

To begin with this application, create a new project in Visual Studio 2005 (VS2005) and add new class by selecting the Add à New Item à Class option by right clicking on your project from solution explorer. Now named this class as CCalStrLen and add the following code:

 

Public Class CCalStrLen

 

 'Global Varaible of String Type

Private ShowStrLength As String

 

  'Get the String From the User

Public Property GetStr() As String

 

  Get

     Return ShowStrLength

  End Get

  Set(ByVal value As String)

     ShowStrLength = value

  End Set

 

End Property

 

 'Calculate the length of the String

Public ReadOnly Property StrLen() As Long

 

  Get

    StrLen = Len(Me.ShowStrLength)

  End Get

 

End Property

 

End Class

 

Now all you have to do is add TextBox control, Button Control and Label control in your Form1.vb file and add the following code on  event:

 

Public Class Form1

 

Private Sub cmdSLength_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdSLength.Click

 

Dim StringLength As New CCalStrLen

 

'Checks the length of the String

'if Zero error message is displayed

 

If (txtSLength.Text.Length > 0) Then

 

    StringLength.GetStr = txtSLength.Text

 

Else

 

MsgBox("Enter String First", MsgBoxStyle.OkOnly, "Error Message")

 

End If

 

'Show the Length of the String

'which is entered by user

 

txtSLength.Text = StringLength.GetStr

lblShow.Visible = True

lblShow.Text = StringLength.StrLen.ToString

 

End Sub

 

End Class

 

   
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