Question

I want to return a DataTable from DLL file that is Created from ClassLibrary Project. So is it possible to return a DataTable from the DLL file which contain the code to return the DataTable? And also i want to use this in asp.net website.
Plz give any suggestions…!
EG:

public DataTable getData()
    {
       DataTable dt=new DataTable("Test");
       SqlCommand cmd=new SqlCommand();
       SqlDataAdapter da=new SqlDataAdapter();
       using(SqlConnection con=new SqlConnection(ConfigurationManager.ConnectionStrings["EMP"].ConnectionString))
        {
            da.SelectCommand = con.CreateCommand();
            da.SelectCommand.CommandType = CommandType.Text;
            da.SelectCommand.CommandText = "Select *from EMP";
            da.SelectCommand.Connection = con;
            try
            {
                con.Open();
                da.Fill(dt);
                con.Close();
            }
            catch (Exception ec)
            {

            }
            finally
            {

                con.Close();
            }

        }
        return dt;
    }

Answer 1

Yes it is possible to return Datatable. What you are doing is correct. Make sure that you provide Connection string value of

ConfigurationManager.ConnectionStrings["EMP"].ConnectionString

some how in dll.

You can provide parameter of getData

public DataTable getData(string constr)
{
   //// Your code

   using(SqlConnection con=new SqlConnection(constr))
   { 
   ///// Your code
}