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[求助] Server Error in '/' Application.怎么解决？急急急！！

具体错误如下：跪求大神帮忙解决，在此拜谢！！

Server Error in '/' Application.
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Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
ExamRequisitionList.dataGridDataBind(String searchCondition) +80
ExamRequisitionList.ddlReqNo_SelectedIndexChanged(Object sender, EventArgs e) +202
System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged(EventArgs e) +111
System.Web.UI.WebControls.DropDownList.RaisePostDataChangedEvent() +134
System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() +10
System.Web.UI.Page.RaiseChangedEvents() +165
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1485

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Version Information: Microsoft .NET Framework Version:2.0.50727.5420; ASP.NET Version:2.0.50727.5420

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