IsDBNull : String Functions « Data Type « VB.Net Tutorial






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Public Module modMain
   Public Sub Main()
      Dim title As String = "Mr."
      Dim name As Object = DBNull.Value
      Dim addressLine1 As String = title & " " & name
      If IsDBNull(addressLine1) Then
         Console.WriteLine("Null value")
      Else
         Console.WriteLine(addressLine1)
      End If
   End Sub
End Module

Mr.




2.38.String Functions
2.38.1.Passing String values to Val
2.38.2.Passing formatted numeric values to Val
2.38.3.IsNumeric, IsDate, IsNothing
2.38.4.Duplicate a string
2.38.5.Get string index by using InStr
2.38.6.CStr: Convert Double to String
2.38.7.Len: get string length
2.38.8.Instr
2.38.9.IsDBNull
2.38.10.Microsoft.VisualBasic.Left
2.38.11.String.Copy
2.38.12.Use String.Concat to concatenate two strings
2.38.13.Format: c
2.38.14.String handling function: Len
2.38.15.Left: get characters from left
2.38.16.Right: get characters from right
2.38.17.Mid(string, 4, 5): get sub string from middle
2.38.18.Mid(string, 7): get sub string from start
2.38.19.Instr: find character in a string
2.38.20.Instr: find sub string a in a string
2.38.21.LCase: change string to lower case
2.38.22.UCase: change string to upper case
2.38.23.Change string case using the English-United States and Turkish-Turkey cultures and then compare
2.38.24.Determines whether a string is normalized to various normalization forms(String.Normalize and the String.IsNormalized method)