如何調試此表單上的500錯誤？

Question

我繼承了使用VB Studio構建的網站，我試圖讓表單在本頁面上工作：http://childplus.com/Support/我在所有窗體上的不同用戶的不同瀏覽器中發生了大量500錯誤。我只是想要工作表單！

到目前爲止，無論瀏覽器如何，單擊提交按鈕後都會返回500錯誤。但是，我仍然不熟悉使用VB Studio開發Web表單。任何有關調試和修復500新手錯誤的見解或指示將不勝感激。

從頁面的實際形式：

<form id="form_support" runat="server"> 
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"></asp:ToolkitScriptManager> 

<!--Name--> 
<div class="FormLine"> 
<asp:Label ID="lblName" runat="server" Text="Name:" CssClass="Txt"></asp:Label><p class="required">(required)</p> 
<asp:TextBox ID="FullName" runat="server" class="TxtBox" TabIndex="1" MaxLength="100"></asp:TextBox> 
<asp:RequiredFieldValidator Display="Static" ID="RequiredFieldValFullname" runat="server" ControlToValidate="FullName" ToolTip="Name is Required" EnableClientScript="False" SetFocusOnError="true"></asp:RequiredFieldValidator> 

</div> 

<!--Agency--> 
<div class="FormLine"> 
<asp:Label ID="lblAgency" runat="server" Text="Agency:" CssClass="Txt"></asp:Label><p class="required">(required)</p> 
<asp:TextBox ID="AgencyName" runat="server" class="TxtBox" TabIndex="2" MaxLength="100"></asp:TextBox> 
<asp:RequiredFieldValidator Display="Static" ID="RequiredFieldValAgencyName" runat="server" ControlToValidate="AgencyName" ToolTip="Agency is Required" EnableClientScript="False" SetFocusOnError="true"></asp:RequiredFieldValidator><br /> 

</div> 

<!--Email--> 
<div class="FormLine"> 
<asp:Label ID="lblemail" runat="server" Text="Email:" CssClass="Txt"></asp:Label><p class="required">(required)</p> 
<asp:TextBox ID="email" runat="server" class="TxtBox" TabIndex="3" MaxLength="100"></asp:TextBox> 
<asp:RequiredFieldValidator Display="Static" ID="RequiredFieldValEmail" runat="server" ControlToValidate="email" ToolTip="Email is Required" EnableClientScript="False"></asp:RequiredFieldValidator> 
<asp:RegularExpressionValidator Display="Static" ID="RegularExpressionValEmail" ErrorMessage="Email is not valid." ControlToValidate="email" runat="server" ToolTip="Email is not valid." ValidationExpression="^(['_a-z0-9-]+)(\.['_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,5})$"></asp:RegularExpressionValidator> 

</div> 

<!--Phone--> 
<div class="FormLine"> 
<asp:Label ID="lblPhone" runat="server" Text="Phone:" CssClass="Txt"></asp:Label><p class="required">(required)</p> 

<asp:TextBox ID="phone" runat="server" class="TxtBox" TabIndex="4" MaxLength="30"></asp:TextBox> 
<asp:RequiredFieldValidator Display="Static" ID="RequiredFieldValPhone" runat="server" ControlToValidate="phone" ToolTip="Phone is Required" EnableClientScript="False" SetFocusOnError="true"></asp:RequiredFieldValidator><br /> 

</div> 

<!--Subject--> 
<div class="FormLine"> 
<asp:Label ID="lblSubject" runat="server" Text="Subject:" CssClass="Txt"></asp:Label><p class="required">(required)</p> 
<asp:DropDownList ID="ddlSubject" runat="server" class="TxtBox1" TabIndex="5"></asp:DropDownList> 
<asp:RequiredFieldValidator Display="Static" ID="RequiredFieldValddlSubject" runat="server" ControlToValidate="ddlSubject" ToolTip="Subject is Required." InitialValue="" EnableClientScript="False"></asp:RequiredFieldValidator>       

</div> 

<!--Topic--> 
<div class="FormLine"> 
<span class="Txt">Topic:</span> 
<asp:DropDownList ID="ddlTopic" runat="server" class="TxtBox1" TabIndex="6"></asp:DropDownList> 
<asp:CascadingDropDown ID="CascadingDropDown1" runat="server" TargetControlID="ddlSubject" Category="subject" prompttext="Select a Subject..." ServicePath="~/wbSubjectTopics.asmx" ServiceMethod="GetDropDownContents"> 
</asp:CascadingDropDown> 
<asp:CascadingDropDown ID="CascadingDropDown2" runat="server" TargetControlID="ddlTopic" Category="topic" prompttext="Select a Topic..." LoadingText="Loading..." ParentControlID="ddlSubject" ServicePath="~/wbSubjectTopics.asmx" ServiceMethod="GetDropDownContents"> 
</asp:CascadingDropDown> 
</div> 

<!--Details--> 
<div class="FormMultiLine"> 
<span class="Txt2">Please include as much detail as possible including:</span> 
    <ul> 
    <li>What steps you did.</li> 
    <li>Your computer's operating system.</li> 
    <li>Exact text of any error message.</li> 
    </ul> 

<asp:TextBox ID="Comments" class="TxtBoxMulti" runat="server" TextMode="MultiLine" TabIndex="7" ></asp:TextBox>       
</div> 


<!--Submit--> 
<div id="SubBtnWrapper" class="SubBtnBlue"> 
    <asp:LinkButton ID="SubBtn" text="" title="Submit" runat="server" TabIndex="8"> 
    <div class="rollover_wrapper"><div class="submit_rollover"><img src="../../Images/Forms/submit_btn_blue.png" height="78px" width="79px" /></div></div> 
    </asp:LinkButton> 
</div> 


<script type="text/javascript" language="JavaScript"><!-- document.form_support.FullName.focus(); //--></script> 
</form> 

</div> 

代碼隱藏： 進口通用

Partial Public Class Support_homepage 
    Inherits System.Web.UI.Page 
    Public Utils As Utils = New Utils 


    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 

    End Sub 

    Protected Sub ddlSubject_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles ddlSubject.SelectedIndexChanged 
     ddlTopic.SelectedIndex = -1 
    End Sub 

    Private Sub SubBtn_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles SubBtn.Click 
     Page.Validate() 

     If (Page.IsValid) Then 
      Dim EmailBody As String 

      Dim strSubjectTopic As String 

      If ddlTopic.SelectedValue = "" Then 
       strSubjectTopic = ddlSubject.SelectedValue 
      Else 
       strSubjectTopic = ddlTopic.SelectedValue 
      End If 

      EmailBody = "<p style=" + "font-family:Verdana;" + "><strong>Technical Support Request:</strong></p><p style=" + "font-family:Verdana;" + "><strong>Name:</strong> " + FullName.Text + "</p>" 
      EmailBody = EmailBody + "<p style=" + "font-family:Verdana;" + "><strong>Email:</strong> " + email.Text + "</p>" 
      EmailBody = EmailBody + "<p style=" + "font-family:Verdana;" + "><strong>Phone:</strong> " + phone.Text + "</p>" 
      EmailBody = EmailBody + "<p style=" + "font-family:Verdana;" + "><strong>Agency:</strong> " + AgencyName.Text + "</p>" 
      EmailBody = EmailBody + "<p style=" + "font-family:Verdana;" + "><strong>Subject/Topic:</strong> " + strSubjectTopic + "</p>" 
      EmailBody = EmailBody + "<p style=" + "font-family:Verdana;" + "><strong>Comments:</strong> " + Comments.Text + "</p>" 

      Utils.SendAppNotificationEmails("support@childplus.com", "support@childplus.com", "Website: Technical Support Request", EmailBody) 
      Response.Redirect("/") 
     Else 
      If RequiredFieldValFullname.IsValid Then 
       lblName.CssClass = "Txt" 
      Else 
       lblName.CssClass = "ErrorTxt" 
      End If 

      If RequiredFieldValAgencyName.IsValid Then 
       lblAgency.CssClass = "Txt" 
      Else 
       lblAgency.CssClass = "ErrorTxt" 
      End If 

      If RequiredFieldValPhone.IsValid Then 
       lblPhone.CssClass = "Txt" 
      Else 
       lblPhone.CssClass = "ErrorTxt" 
      End If 

      If RequiredFieldValEmail.IsValid Then 
       lblemail.CssClass = "Txt" 
      Else 
       lblemail.CssClass = "ErrorTxt" 
      End If 


      If RequiredFieldValddlSubject.IsValid Then 
       lblSubject.CssClass = "Txt" 
      Else 
       lblSubject.CssClass = "ErrorTxt" 
      End If 
     End If 
    End Sub 


End Class 

這裏的堆棧跟蹤：

Server Error in '/' Application. 

Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. 

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.ArgumentException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. 

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: 


[ArgumentException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.] 
    System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +8644665 
    System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +69 
    System.Web.UI.WebControls.DropDownList.LoadPostData(String postDataKey, NameValueCollection postCollection) +53 
    System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +13 
    System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +343 
    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1743 

Answer 1

嘗試在此描述的解決方案文章 http://johanleino.wordpress.com/2011/04/09/revisedcascadingdropdown-casues-invalid-postback-or-callback-argument-error/