Hi florenz,

Can you please explain your requirement in more detail?

When I create an artificial, I will look if the GUID exists in the database (table)

Hi florenz,

You can refer below Stored Procedure where the checking is done whether GUID exists in database table or not.

You need to modify the SP according to you table structure

SQL

CREATE PROCEDURE [dbo].[CheckGUID]
      @guid NVARCHAR(MAX)
AS
BEGIN
    SET NOCOUNT ON;
    IF NOT EXISTS(SELECT [GUID] FROM artificial WHERE [GUID] = @guid)
		BEGIN
				SELECT 'Not Exist'
		END
    ELSE
		BEGIN
				SELECT 'Exist'
		END
	END
END

You can refer below article for more detail on checking of existing record in database table.

Check whether User is Logged in or not in ASP.Net using C# and VB.Net