Without Looping Comma Separated String DataTable Column in Vb.net /C#

Step 1: Import NameSpace

Imports System.Linq

Step 2: Use Function

dt is returning value in datatable.

Public Function CommaSeparated()
Dim strName As String = String.Empty
Try
strName += String.Join(",", (From row In dt.Rows Select CType(row.Item("columnname"), String)).ToArray)
Console.writeline(strName)
Catch(Exception ex)
Throw New(ex.message)
End Function