 Public Class validation

 Code to Set Maximum Length for Textbox

    Private Sub Form3_Load(ByVal sender As System.Object, ByVal e As  
			System.EventArgs) Handles MyBase.Load

        TextBox2.MaxLength = 4
        TextBox3.MaxLength = 6

    End Sub

Code To get Only Alphabets

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As 
	System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress

If (Asc(e.KeyChar) >= 97 And Asc(e.KeyChar) <= 122) Or (Asc(e.KeyChar) >= 
65 And  Asc(e.KeyChar) <= 90) Or Asc(e.KeyChar) = 8 Or  
	Asc(e.KeyChar) = 46 Then

            e.KeyChar = e.KeyChar
Else
            MsgBox("Only Alphabets Allowed")
       		e.KeyChar = ""
End If

    End Sub

 Code To Get Only Numbers For Employee ID

    Private Sub TextBox2_KeyPress(ByVal sender As Object, ByVal e 
	As System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress

If ((Asc(e.KeyChar) >= 48) And (Asc(e.KeyChar) <= 57)) Or Asc(e.KeyChar) = 8 Then
            		e.KeyChar = e.KeyChar
 Else
            		MsgBox("Enter Only Numbers")
            e.KeyChar = ""
 End If
    End Sub


Code To Get Only Numbers For Salary 

    Private Sub TextBox3_KeyPress(ByVal sender As Object, ByVal e As
 System.Windows.Forms.KeyPressEventArgs) Handles TextBox3.KeyPress

        If ((Asc(e.KeyChar) >= 48) And (Asc(e.KeyChar) <= 57)) And  (Asc(e.KeyChar) 
						<> 49) Or Asc(e.KeyChar) = 8 Then
            e.KeyChar = e.KeyChar

        Else
            MsgBox("Enter Only Numbers")
            	e.KeyChar = ""

        End If

    End Sub

Code To Exit the Application

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

        End

    End Sub

Code To Display Error Message When Emplyee ID Textbox is Empty

    Private Sub TextBox2_LostFocus(ByVal sender As Object, ByVal e As
				System.EventArgs) Handles TextBox2.LostFocus

        If TextBox2.Text = "" Then
            MsgBox("please enter employee ID")
            TextBox2.Focus()
        End If

    End Sub

   
End ClassPublic Class validation

 Code to Set Maximum Length for Textbox

    Private Sub Form3_Load(ByVal sender As System.Object, ByVal e As  
			System.EventArgs) Handles MyBase.Load

        TextBox2.MaxLength = 4
        TextBox3.MaxLength = 6

    End Sub

Code To get Only Alphabets

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As 
	System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress

If (Asc(e.KeyChar) >= 97 And Asc(e.KeyChar) <= 122) Or (Asc(e.KeyChar) >= 
65 And  Asc(e.KeyChar) <= 90) Or Asc(e.KeyChar) = 8 Or  
	Asc(e.KeyChar) = 46 Then

            e.KeyChar = e.KeyChar
Else
            MsgBox("Only Alphabets Allowed")
       		e.KeyChar = ""
End If

    End Sub

 Code To Get Only Numbers For Employee ID

    Private Sub TextBox2_KeyPress(ByVal sender As Object, ByVal e 
	As System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress

If ((Asc(e.KeyChar) >= 48) And (Asc(e.KeyChar) <= 57)) Or Asc(e.KeyChar) = 8 Then
            		e.KeyChar = e.KeyChar
 Else
            		MsgBox("Enter Only Numbers")
            e.KeyChar = ""
 End If
    End Sub


Code To Get Only Numbers For Salary 

    Private Sub TextBox3_KeyPress(ByVal sender As Object, ByVal e As
 System.Windows.Forms.KeyPressEventArgs) Handles TextBox3.KeyPress

        If ((Asc(e.KeyChar) >= 48) And (Asc(e.KeyChar) <= 57)) And  (Asc(e.KeyChar) 
						<> 49) Or Asc(e.KeyChar) = 8 Then
            e.KeyChar = e.KeyChar

        Else
            MsgBox("Enter Only Numbers")
            	e.KeyChar = ""

        End If

    End Sub

Code To Exit the Application

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

        End

    End Sub

Code To Display Error Message When Emplyee ID Textbox is Empty

    Private Sub TextBox2_LostFocus(ByVal sender As Object, ByVal e As
				System.EventArgs) Handles TextBox2.LostFocus

        If TextBox2.Text = "" Then
            MsgBox("please enter employee ID")
            TextBox2.Focus()
        End If

    End Sub

   
End Class

created 4 years ago

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Read input from STDIN in VB.net

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Public Module Program
	Public Sub Main(args() As string)
	 Dim name as String = Console.ReadLine()    ' Reading input from STDIN
   Console.WriteLine("Hello " & name)           ' Writing output to STDOUT
	End Sub
End Module

About VB.net

Visual Basic is a event driven programming language by Microsoft, first released in the year 1991.

Key Features

Beginner's friendly language.
Simple and object oriented programming language.
User friendly language and easy to develop GUI based applications.

Syntax help

Variables

Variable is a name given to the storage area in order to identify them in our programs.

Simple syntax of Variable declaration is as follows

Dim variableName [ As [ New ] dataType ] [ = initializer ]

Variable initialization

variableName = value

Conditional Statements

1. If

If condition-expression Then 
    'code
End If

2. If-else

If(conditional-expression)Then
   'code if the conditional-expression is true 
Else
  'code if the conditional-expression is false 
End If

3. If-else-if ladder

If(conditional-expression)Then
   'code if the above conditional-expression is true 
Else If(conditional-expression) Then
        'code if the above conditional-expression is true 
    Else
        'code if the above conditional-expression is false 
End If

4. Nested-If

If(conditional-expression)Then
   'code if the above conditional-expression is true
   If(conditional-expression)Then
         'code if the above conditional-expression is true 
   End If
End If

5. Select Case

Select [ Case ] expression
   [ Case expressionlist
      'code ]
   [ Case Else
      'code ]
End Select

Loops

1. For..Next

For counter [ As datatype ] = begin To end [ Step step ]
   'code
   [ Continue For ]
   'code
   [ Exit For ]
   'code
Next [ counter ]

2. For..Each

For Each element [ As datatype ] In group
   'code
   [ Continue For ]
   'code
   [ Exit For ]
   'code
Next [ element ]

3. While

While conditional-expression
   'Code 
   [ Continue While ]
   'Code
   [ Exit While ]
   'Code
End While

4. Do-while

Do { While | Until } conditional-expression
   'Code
   [ Continue Do ]
   'Code
   [ Exit Do ]
   'Code
Loop

Do
   'Code
   [ Continue Do ]
   'Code
   [ Exit Do ]
   'Code
Loop { While | Until } conditional-expression

Procedures

Procedure is a sub-routine which contains set of statements. Usually Procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Procedures are of two types.

1. Functions

Functions return a value when they are called.

[accessModifiers] Function functionName [(parameterList)] As returnType
   'code
End Function

2. Sub-Procedures

Sub-procedures are similar to functions but they don't return any value.

Sub ProcedureName (parameterList)
'Code
End Sub