System.OutOfMemoryException" exception when you execute a query c#

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DatabaseConnector connector = new DatabaseConnector();
            connector.OpenConnection();
            try
            {
                DataTable dt = new DataTable();
                SqlDataAdapter da = new SqlDataAdapter(queryString, connector.Connection);
                da.SelectCommand.CommandTimeout = 0;
                da.Fill(dt);
                return dt;
            }
            catch (SqlException ex)
            {
                return null;
             
            }
            catch (Exception ex)
            {
                return null;
            }
            finally
            {
                connector.CloseConnection();
            }



Clear the temp of computer..................




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