[求助]报名参加GRE考试遇到的问题
<p>我在<a href="http://cbt.etest.net.cn">http://cbt.etest.net.cn</a>注册完用户名后，点“新考试预约”的“下一步”，就出现以下信息：</p><p><span>
<h1>Server Error in '/WebSR' Application. <hr width="100%" color="#c0c0c0" size="1"/></h1><h2><i>Object reference not set to an instance of an object.</i>
</h2><p><font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif "><b>Description: </b>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. <br/><br/><b>Exception Details: </b>System.NullReferenceException: Object reference not set to an instance of an object.<br/><br/><b>Source Error:</b>
<br/><br/><table width="100%" bgcolor="#ffffcc"><tbody><tr><td><code><pre>Line 104: string l_ItemNo = Profile._ItemNo;
Line 105:
<font color="#ff0000">Line 106: string l_ItemDesc = _DataFunc._Exams_GetItemDesc(l_ItemNo).ToString();
</font>Line 107: Label _label = (Label)ItemDesc1.FindControl("Label_ItemDesc");
Line 108: _label.Text = l_ItemDesc;</pre></code></td></tr></tbody></table><br/><b><font face="Verdana">Source File: </font></b>d:\webRoot\WebSR\Candidates\BookExam.aspx.cs<b><font face="Verdana"> Line: </font></b>106 <br/><br/><b><font face="Verdana">Stack Trace:</font></b>
<br/><br/><table width="100%" bgcolor="#ffffcc"><tbody><tr><td><code><pre>[NullReferenceException: Object reference not set to an instance of an object.]
Candidates_BookExam.Wizard1_NextButtonClick(Object sender, WizardNavigationEventArgs e) in d:\webRoot\WebSR\Candidates\BookExam.aspx.cs:106
System.Web.UI.WebControls.Wizard.OnNextButtonClick(WizardNavigationEventArgs e) +105
System.Web.UI.WebControls.Wizard.OnBubbleEvent(Object source, EventArgs e) +453
System.Web.UI.WebControls.WizardChildTable.OnBubbleEvent(Object source, EventArgs args) +17
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +35
System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e) +115
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +163
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102
</pre></code></td></tr></tbody></table></font></p></span></p><h1>Server Error in '/WebSR' Application. <hr width="100%" color="#c0c0c0" size="1"/></h1><h2><i>Object reference not set to an instance of an object.</i>
</h2><p><font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif "><b>Description: </b>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. <br/><br/><b>Exception Details: </b>System.NullReferenceException: Object reference not set to an instance of an object.<br/><br/><b>Source Error:</b>
<br/><br/><table width="100%" bgcolor="#ffffcc"><tbody><tr><td><code><pre>Line 104: string l_ItemNo = Profile._ItemNo;
Line 105:
<font color="#ff0000">Line 106: string l_ItemDesc = _DataFunc._Exams_GetItemDesc(l_ItemNo).ToString();
</font>Line 107: Label _label = (Label)ItemDesc1.FindControl("Label_ItemDesc");
Line 108: _label.Text = l_ItemDesc;</pre></code></td></tr></tbody></table><br/><b><font face="Verdana">Source File: </font></b>d:\webRoot\WebSR\Candidates\BookExam.aspx.cs<b><font face="Verdana"> Line: </font></b>106 <br/><br/><b><font face="Verdana">Stack Trace:</font></b>
<br/><br/><table width="100%" bgcolor="#ffffcc"><tbody><tr><td><code><pre>[NullReferenceException: Object reference not set to an instance of an object.]
Candidates_BookExam.Wizard1_NextButtonClick(Object sender, WizardNavigationEventArgs e) in d:\webRoot\WebSR\Candidates\BookExam.aspx.cs:106
System.Web.UI.WebControls.Wizard.OnNextButtonClick(WizardNavigationEventArgs e) +105
System.Web.UI.WebControls.Wizard.OnBubbleEvent(Object source, EventArgs e) +453
System.Web.UI.WebControls.WizardChildTable.OnBubbleEvent(Object source, EventArgs args) +17
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +35
System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e) +115
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +163
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102
</pre></code></td></tr></tbody></table></font></p><p>怎么回事？请帮忙参考一下。谢谢！<br/></p>
