Ext.Net.StoreDataBound.GetDataSource C# (CSharp) Method

        protected virtual IDataSource GetDataSource()
        {
            if (this.IsBoundUsingDataSourceID)
            {
                Control ctrl = Utilities.ControlUtils.FindControl(this, this.DataSourceID);

                if (ctrl == null)
                {
                    throw new HttpException("A IDatasource Control with the ID '{0}' could not be found.".FormatWith(this.DataSourceID));
                }

                if (!(ctrl is IDataSource))
                {
                    throw new HttpException("The control with ID '{0}' is not a control of type IDataSource.".FormatWith(this.DataSourceID));
                }

                return (IDataSource)ctrl;
            }

            if (this.DataSource == null)
            {
                return null;
            }

            IDataSource ds = this.DataSource as IDataSource;
            
            if (ds != null)
            {
                return ds;
            }

            IEnumerable ie = ResolveDataSource(DataSource, DataMember);

            if (ie != null)
            {
                return new CollectionDataSource(ie);
            }

            throw new HttpException("Unexpected data source type: {0}".FormatWith(DataSource.GetType()));
        }