Tagvb

TrimEnd & Like in VB.NET

This example illustrates trimming the “!” character from the end of the string

 
    Dim str As String = "This is a string, with a comma!"
    str = str.TrimEnd(CChar("!"))
    MsgBox(str)

This example look for 4 numbers after 2 specific characters

 
    Dim phoneNum As String = "CT8964"
    If (phoneNum Like "CT####") Then
      MsgBox("Found it")
    Else
      MsgBox("Nope")
    End If

Compare Files

This example illustrates how to compare two files.

Imports System.IO
Imports System.Security.Cryptography

Public Class Form1

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load

If CompareFiles("C:\Temp\2filecopy.bat", "C:\Temp\4filecopy.bat") = True Then
  MsgBox("The same")
Else
  MsgBox("Different")
End If

  End
End Sub

Public Function CompareFiles(ByVal FileFullPath1 As String, ByVal FileFullPath2 As String) As Boolean
'returns true if two files passed to is are identical, false otherwise
'does byte comparison; works for both text and binary files

'Throws exception on errors; you can change to just return 
'false if you prefer

Dim objMD5 As New MD5CryptoServiceProvider()
Dim objEncoding As New System.Text.ASCIIEncoding()
Dim aFile1() As Byte, aFile2() As Byte
Dim strContents1, strContents2 As String
Dim objReader As StreamReader
Dim objFS As FileStream
Dim bAns As Boolean

'If Not File.Exists(FileFullPath1) Then _
' Throw New Exception(FileFullPath1 & " doesn't exist")
'If Not File.Exists(FileFullPath2) Then _
' Throw New Exception(FileFullPath2 & " doesn't exist")

If Not File.Exists(FileFullPath1) Or Not File.Exists(FileFullPath2) Then
  Return False
  Exit Function
End If

Try
  objFS = New FileStream(FileFullPath1, FileMode.Open)
  objReader = New StreamReader(objFS)
  aFile1 = objEncoding.GetBytes(objReader.ReadToEnd)
  strContents1 = _
  objEncoding.GetString(objMD5.ComputeHash(aFile1))
  objReader.Close()
  objFS.Close()

  objFS = New FileStream(FileFullPath2, FileMode.Open)
  objReader = New StreamReader(objFS)
  aFile2 = objEncoding.GetBytes(objReader.ReadToEnd)
  strContents2 = _
  objEncoding.GetString(objMD5.ComputeHash(aFile2))

  bAns = strContents1 = strContents2
  objReader.Close()
  objFS.Close()
  aFile1 = Nothing
  aFile2 = Nothing

Catch ex As Exception
  Throw ex
End Try

Return bAns
End Function
End Class

AutoTab to Next Field

Private Sub txtIP3_TextChanged(sender As Object, e As EventArgs)
Handles txtIP3.TextChanged

If txtIP3.Text.Length = txtIP3.MaxLength _
  Then SelectNextControl(ActiveControl, True, True, True, True)

End Sub

VB.NET Module for SQL Database

Imports System.Data.SqlClient

Module modDatabase

Public conn As New SqlClient.SqlConnection
Public myReader As SqlDataReader

Public dsRecords As New DataSet
Public daRecords As New SqlDataAdapter
Public MaxRecords As Integer

Public Sub OpenDatabase()
CloseSQLReader()
CloseDatabase()

conn.ConnectionString = “Server=.\sqlexpress;Database=DATABASE;Trusted_Connection=True;”
conn.Open()
End Sub

 

Public Sub CloseDatabase()
Try
conn.Close()
conn.Dispose()
Catch ex As Exception
Application.DoEvents()
End Try
End Sub

 

Public Sub launchBrowser(ByVal browser As String, ByVal url As String)
Try
Process.Start(browser, url)
Catch ex As Exception
Application.DoEvents()
‘MessageBox.Show(ex.Message)
End Try
End Sub

 

Public Sub CloseSQLReader()
Try
myReader.Close()
Catch ex As Exception
Application.DoEvents()
End Try
End Sub

 

Public Sub ReadSqlData(ByVal sqlSelect As String)
Dim myCommand As New SqlCommand(sqlSelect, conn)
myReader = myCommand.ExecuteReader()
End Sub

 

Public Function ExecuteSqlCommand(ByVal sqlSelect As String) As Boolean
Dim flg As Boolean = False
Dim myCommand As New SqlCommand(sqlSelect, conn)

Try
flg = myCommand.ExecuteNonQuery
Catch
flg = False
End Try

Return flg
End Function

 

Public Sub HoldYourPants(ByVal Seconds As Integer)
System.Threading.Thread.Sleep(Seconds * 1000)
Application.DoEvents()
End Sub

End Module

Determine if a user belongs to a particular AD Group

This is the easiest way to determine if a user belongs to particular Active Directory user group using VB.NET without having to enumerate through all the user’s groups.

Public Function IsInGroup(ByVal GroupName As String) As Boolean
 Dim MyIdentity As System.Security.Principal.WindowsIdentity = System.Security.Principal.WindowsIdentity.GetCurrent()
 Dim MyPrincipal As System.Security.Principal.WindowsPrincipal = New System.Security.Principal.WindowsPrincipal(MyIdentity)
 Return MyPrincipal.IsInRole(GroupName)
End Function