VB.NET Mid() – Code Sample

Posted by on Tuesday, February 8, 2011 · Leave a Comment 

VB.NET Mid Example – Code Sample Syntax

Abstract: – Illustrates using .

 *** 1. Download Source Code *** 
VB.NET Syntax StringManipulation Mid download Download Source Code for All VB Console Examples in One Project

 *** 2. Mid Syntax *** 


Purpose:
Returns the specified number of characters from the string starting
at the specified position. If the length is not specified, all of the
characters to the end of the string are returned


Syntax:
Mid(string, startIndex[, length])

Parameters Description
string Required – String of which you want to return a portion
startIndex Required – Integer (not zero-based) that indicates
starting point
length Optional – Integer that indicates number of characters
to return. If the length is not specified, all of the characters to
the end of the string are returned

Result Data Type Description
string Returns the specified number of characters from the string starting
at the specified position. If the length is not specified, all of the
characters to the end of the string are returned


 *** 3. Mid – Quick Example *** 
Dim strField As String = ” This “
Console.WriteLine(“[” + LTrim(strField) + “]”) ‘Returns [This ] with leading spaces removed

 *** 4. Mid – Full Example *** 

Mid Example Output Screenshot


VB.NET Syntax StringManipulation Mid screenshot


Step 1: Click Visual Basic to Cut-n-paste code into clsMid.vb

Public Class clsMid
 
    Public Sub Main()
 
 
        '****************************************************************************************
        ' Purpose:  Returns the specified number of characters from the string starting
        ' at the specified position. If the length is not specified, all of the 
        ' characters to the end of the string are returned
        '
        ' Syntax: 	Mid(string, startIndex[, length])
        '
        ' Parameter1: string - Required - String of which you want to return a portion
        '
        ' Parameter2: startIndex - Required - Integer (not zero-based) that indicates
        ' starting point
        '
        ' Parameter3: length - Optional - Integer that indicates number of characters
        ' to return. If the length is not specified, all of the characters to 
        ' the end of the string are returned
        '
        ' Result: string -  Returns the specified number of characters from the string starting
        ' at the specified position. If the length is not specified, all of the 
        ' characters to the end of the string are returned
        '
        ' Quick Example:     Dim strField As String = " This "
        ' Console.WriteLine("[" + LTrim(strField) + "]") 'Returns [This ] with leading spaces removed
        '
        '****************************************************************************************
        '****************************************************************************************
        ' Example #1: Mid(string, startIndex[, length])
        ' Returns the specified number of characters from the string starting
        ' at the specified position. If the length is not specified, all of the 
        ' characters to the end of the string are returned
        '****************************************************************************************
 
        Console.WriteLine("Example #1: Mid(strField, 2, 3)")
 
        Dim strField As String = "123456"
 
        Console.WriteLine(Mid(strField, 2, 3)) 'Returns 234
 
        'write blank line to make output easier to read
        Console.WriteLine()
 
 
 
        'Prevent console from closing before you press enter
        Console.ReadLine()
 
    End Sub
 
 
End Class

Step 2: Click Visual Basic to Cut-n-paste code into Module1.vb

Module Module1
 
    Sub Main()
 
 
        Dim myclsMid As New clsMid
        myclsMid.Main()
 
 
 
    End Sub
 
End Module

Prerequistes:

  1. Install Visual Basic (Express or Standard Edition)
  2. Install SQL Server Express
  3. Download Northwind and pubs Database
  4. Attach Northwind Database to Databases in Sql Express
  5. Attach pubs Database to Databases in Sql Express

Notes:

  • Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
  • You can build a library of syntax examples by using same project over and over and just commenting out what you do not want to execute in Module1.vb

Instructions:
VB.NET Syntax StringManipulation Mid

  1. Use Visual Basic 2010 Express or Standard Edition
  2. Create new project;
    • Click File/New Project
    • Select Console Application Template
    • Select Visual Basic for Language
    • name of project could be VBNET_Syntax.
  3. Add New folder named “StringManipulation”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: StringManipulation
  4. Add Class Named clsMid to StringManipulation folder
    • Right-click StringManipulation folder;
    • add new item;
    • Select class
    • Class name could be clsMid
  5. Click on Visual Basic in code in step 1 above to copy code into clsMid.vb
  6. Click on Visual Basic in code in step 2 above to copy code into Module1.vb
  7. Click green arrow or press F5 to run program

Filed under Code Samples · Tagged with , , , ,