Public Class _04_inputbox_messagebox
Private Sub btn_vbOK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_vbOK.Click
Dim m As Integer
m = MessageBox.Show("This messagebox will display only OK button", "OK messagebox", MessageBoxButtons.OK)
If m = 1 Then
MessageBox.Show("you clicked ok")
End If
End Sub
Private Sub lblDisplay_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lblDisplay.Click
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnvbCancel.Click
Dim m As Integer
m = MessageBox.Show("This messagebox will display only OK and cancel button", "OK Cancel messagebox", MessageBoxButtons.OKCancel)
If m = 1 Then
MessageBox.Show("you clicked ok")
Else
MessageBox.Show("you clicked cancel")
End If
End Sub
Private Sub btnInputbox_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnInputbox.Click
Dim userMsg As String
userMsg = InputBox("Enter any number?", "Message Entry Form", , 400, 300)
If userMsg <> "" Then
MessageBox.Show(userMsg)
Else
MessageBox.Show("No Message")
End If
End Sub
Private Sub btnAborttryIgnoreR_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAborttryIgnoreR.Click
Dim m As Integer
m = MessageBox.Show("This messagebox will display only Abort, Retry and Ignore", "", MessageBoxButtons.AbortRetryIgnore)
If m = 3 Then
MessageBox.Show("you clicked Abort")
ElseIf m = 4 Then
MessageBox.Show("you clickedet Rry")
ElseIf m = 5 Then
MessageBox.Show("you clicked Ignore")
End If
End Sub
Private Sub btnRetryCancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRetryCancel.Click
Dim m As Integer
m = MessageBox.Show("This messagebox will display only Retry and cancel button", "Retry Cancel", MessageBoxButtons.RetryCancel)
If m = 4 Then
MessageBox.Show("you clicked Retry")
ElseIf m = 2 Then
MessageBox.Show("you clicked Cancel")
End If
End Sub
Private Sub btnYesNo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnYesNo.Click
Dim m As Integer
m = MessageBox.Show("This messagebox will display only Yes and No button", "", MessageBoxButtons.YesNo)
If m = 6 Then
MessageBox.Show("you clicked Yes")
ElseIf m = 7 Then
MessageBox.Show("you clicked No")
End If
End Sub
Private Sub btnYesNoCancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnYesNoCancel.Click
Dim m As Integer
m = MessageBox.Show("This messagebox will display only Yes,No and cancel button", "", MessageBoxButtons.YesNoCancel)
If m = 6 Then
MessageBox.Show("you clicked Yes")
ElseIf m = 7 Then
MessageBox.Show("you clicked No")
ElseIf m = 2 Then
MessageBox.Show("you clicked Cancel")
End If
End Sub
Private Sub btnVbCritical_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnVbCritical.Click
MessageBox.Show("This indicates a critical error", "", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Sub
Private Sub vbInformation_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles vbInformation.Click
MessageBox.Show("This indicates a some information", "", MessageBoxButtons.OK, MessageBoxIcon.Asterisk)
End Sub
Private Sub btnVbQuestion_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnVbQuestion.Click
MessageBox.Show("This indicates a a question", "", MessageBoxButtons.OK, MessageBoxIcon.Question)
End Sub
Private Sub btnVbExclamation_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnVbExclamation.Click
MessageBox.Show("", "", MessageBoxButtons.OK, MessageBoxIcon.Exclamation
)
End Sub
End Class
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OneCompiler's VB.net online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample VB.net program which takes name as input and prints hello message with your name.
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
Visual Basic is a event driven programming language by Microsoft, first released in the year 1991.
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 ]
variableName = value
If condition-expression Then
'code
End If
If(conditional-expression)Then
'code if the conditional-expression is true
Else
'code if the conditional-expression is false
End If
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
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
Select [ Case ] expression
[ Case expressionlist
'code ]
[ Case Else
'code ]
End Select
For counter [ As datatype ] = begin To end [ Step step ]
'code
[ Continue For ]
'code
[ Exit For ]
'code
Next [ counter ]
For Each element [ As datatype ] In group
'code
[ Continue For ]
'code
[ Exit For ]
'code
Next [ element ]
While conditional-expression
'Code
[ Continue While ]
'Code
[ Exit While ]
'Code
End 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
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.
Functions return a value when they are called.
[accessModifiers] Function functionName [(parameterList)] As returnType
'code
End Function
Sub-procedures are similar to functions but they don't return any value.
Sub ProcedureName (parameterList)
'Code
End Sub