Convert List to Comma Seperated String in C#

List<string> List = new List<string>();

string.Join(",", List);

Comma Seperated String Function in Sql Server

Create function [dbo].[Split]

(

       @RowData nvarchar(2000),

       @SplitOn nvarchar(5)

) 

RETURNS @RtnValue table

(

       Id int identity(1,1),

       Data nvarchar(100)

)

AS 

BEGIN

       Declare @Cnt int

       Set @Cnt = 1

       While (Charindex(@SplitOn,@RowData)>0)

       Begin

              Insert Into @RtnValue (data)

              Select Data = Ltrim(Rtrim(Substring(@RowData,1,Charindex(@SplitOn,@RowData)-1)))

              Set @RowData = Substring(@RowData,Charindex(@SplitOn,@RowData)+1,len(@RowData))

              Set @Cnt = @Cnt + 1

       End

      

       Insert Into @RtnValue (data)

       Select Data = Ltrim(Rtrim(@RowData))

       Return

END