System.NullReferenceException: 未将对象引用设置到对象的实例。 at System.Data.Common.Dbnetlib.ConnectionError(HandleRef pConnectionObject, IntPtr& netErr, IntPtr& netMsg, IntPtr& dberr) at System.Data.SqlClient.TdsParser.ProcessNetlibError(IntPtr errno) at System.Data.SqlClient.TdsParser.ReadNetlib(Int32 bytesExpected) at System.Data.SqlClient.TdsParser.ReadBuffer() at System.Data.SqlClient.TdsParser.ReadByteArray(Byte[] buff, Int32 offset, Int32 len) at System.Data.SqlClient.TdsParser.ReadEncodingChar(Int32 length, Encoding encoding) at System.Data.SqlClient.TdsParser.ReadValue(_SqlMetaData md, Int32 length) at System.Data.SqlClient.TdsParser.ProcessRow(_SqlMetaData[] columns, Object[] buffer, Int32[] map, Boolean useSQLTypes) at System.Data.SqlClient.SqlDataReader.PrepareRecord(Int32 i) at System.Data.SqlClient.SqlDataReader.GetValue(Int32 i) at System.Data.SqlClient.SqlDataReader.get_Item(String name) at Car.Products_New.ClassName(Int32 ID, Int32 TypeID) at ASP.Products_New_aspx.__DataBind__control9(Object sender, EventArgs e) in d:\www\wwwhtcarcom\products_new.aspx:line 184 at System.Web.UI.Control.OnDataBinding(EventArgs e) at System.Web.UI.Control.DataBind() at System.Web.UI.Control.DataBind() at System.Web.UI.Control.DataBind() at System.Web.UI.WebControls.DataGrid.CreateItem(Int32 itemIndex, Int32 dataSourceIndex, ListItemType itemType, Boolean dataBind, Object dataItem, DataGridColumn[] columns, TableRowCollection rows, PagedDataSource pagedDataSource) at System.Web.UI.WebControls.DataGrid.CreateControlHierarchy(Boolean useDataSource) at System.Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e) at System.Web.UI.WebControls.BaseDataList.DataBind() at Car.Products_New.DataGridBind()