System.Data.DataTable.Reset C# (CSharp) Method

        public virtual void Reset()
        {
            long logScopeId = DataCommonEventSource.Log.EnterScope("<ds.DataTable.Reset|API> {0}", ObjectID);
            try
            {
                Clear();
                ResetConstraints();

                DataRelationCollection dr = ParentRelations;
                int count = dr.Count;
                while (count > 0)
                {
                    count--;
                    dr.RemoveAt(count);
                }

                dr = ChildRelations;
                count = dr.Count;
                while (count > 0)
                {
                    count--;
                    dr.RemoveAt(count);
                }

                Columns.Clear();
                _indexes.Clear();
            }
            finally
            {
                DataCommonEventSource.Log.ExitScope(logScopeId);
            }
        }

        protected void btnLoad_Click(object sender, EventArgs e)
        {
            GridWeb1.WorkSheets.Clear();

            // Connect database
            System.Data.OleDb.OleDbConnection oleDbConnection1 = new OleDbConnection();
            System.Data.OleDb.OleDbDataAdapter oleDbDataAdapter1 = new OleDbDataAdapter();
            System.Data.OleDb.OleDbCommand oleDbSelectCommand1 = new OleDbCommand();
            string path = (this.Master as Site).GetDataDir();
            oleDbConnection1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path + "\\Worksheets\\Database\\Northwind.mdb";
            oleDbSelectCommand1.Connection = oleDbConnection1;
            oleDbDataAdapter1.SelectCommand = oleDbSelectCommand1;

            DataTable dataTable1 = new DataTable();
            dataTable1.Reset();

            try
            {
                oleDbSelectCommand1.CommandText = "SELECT * FROM Products";
                oleDbDataAdapter1.Fill(dataTable1);
                
                // Import data from database to grid web
                GridWeb1.WorkSheets.ImportDataView(dataTable1.DefaultView, null, null);
            }
            finally
            {
                // Close connection
                oleDbConnection1.Close();
            }
        }