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xml i see your private msg i use this code and it give me a good result Dim ds As New DataSet, Sql As String = "", cmd As New SqlClient.SqlCommand Dim da As New SqlClient.SqlDataAdapter("select * from commpany", db) da.AcceptChangesDuringUpdate = False ' this line very important...

ok take this carzy idea for each function you have in your dll add an argument to it like public function XXXXX(byval yourvar,byval licenskey as string) and make your oun string and then for the begin of each function make that if licenskey <> "your oun string" exit function and soo on

thanks to all i solved

thanks all

hi akhhttar my program is to transfer data from one place to another i read the data on dataset and then write to xml with xmlwritemode.writeschema from my code i have that error Prepared statement '(@ItmCode nvarchar(25),@itmBarCode nvarchar(20),@ItmArabName nva' expects parameter...

any one help please

please any one tel me what is wrong i try to read an xml file to dataset and update an table on my database her is my code Dim ds AsNew DataSet, Sql AsString = "", cmd AsNew SqlClient.SqlCommand Dim dv As DataView Dim dai AsNew SqlClient.SqlDataAdapter("select * from Items", db) 'dai.Fill(ds...