Question : Checking Alphanumeric Character

Is there any function in VB.Net with which you can check if a string is alphanumeric or not? I mean which will return false if there is any character other than alphabets or numbers?

Answer : Checking Alphanumeric Character

You can write your own function.  Here is one approach:

    Private Function isAlphaNumeric(ByVal strInput As String) As Boolean
        Dim validChars As String = "abcdefghijklmnopqrstuvwxyz1234567890"
        Dim i As Integer
        For i = 0 To strInput.Length - 1
            If validChars.IndexOf(strInput.Substring(i, 1)) = -1 Then
                Return False
            End If
        Next
        Return True
    End Function