Data Error????????急

Question

Data error.
说明: 执行当前 Web 请求期间，出现未经处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。

异常详细信息: System.ApplicationException: Data error.

源错误:

执行当前 Web 请求期间生成了未经处理的异常。可以使用下面的异常堆栈跟踪信息确定有关异常原因和发生位置的信息。

堆栈跟踪:

[ApplicationException: Data error.]
DatabaseComponent.EmployeeDB.GetEmployees() in D:\Code\Pro ASP.NET 4\Chapter09\DatabaseComponent\EmployeeDB.cs:232

[TargetInvocationException: 调用的目标发生了异常。]
System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) +0
System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) +192
System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +108
System.Web.UI.WebControls.ObjectDataSourceView.InvokeMethod(ObjectDataSourceMethod method, Boolean disposeInstance, Object& instance) +487
System.Web.UI.WebControls.ObjectDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +1609
System.Web.UI.WebControls.ListControl.OnDataBinding(EventArgs e) +101
System.Web.UI.WebControls.ListControl.PerformSelect() +34
System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +30
System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +105
System.Web.UI.WebControls.ListControl.OnPreRender(EventArgs e) +23
System.Web.UI.WebControls.ListBox.OnPreRender(EventArgs e) +12
System.Web.UI.Control.PreRenderRecursiveInternal() +83
System.Web.UI.Control.PreRenderRecursiveInternal() +155
System.Web.UI.Control.PreRenderRecursiveInternal() +155
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +974

Answer 1

DatabaseComponent.EmployeeDB.GetEmployees()
这个方法你怎么写的。