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Posted on 2009-05-12
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Last Modified: 2012-05-06
hello there,

I'm getting this error message: What does it mean?

The type 'System.Web.UI.ScriptManager' is ambiguous: it could come from assembly 'C:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\1.0.61025.0__31bf3856ad364e35\System.Web.Extensions.dll' or from assembly 'C:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll'. Please specify the assembly explicitly in the type name.
<fieldset>

        <legend class="icon-visitadd">Add a Participant Evaluation</legend>

        <table>

            <tr>

                <td><asp:Label ID="lblDateOfVisit" runat="server" AssociatedControlID="txtVisitDate" Text="Date of Visit:" />

            <asp:RequiredFieldValidator ID="valVisitDate2" runat="server" ControlToValidate="txtVisitDate"

                        ErrorMessage="Please enter a visit date." SetFocusOnError="True" ValidationGroup="valGrpVisit">*</asp:RequiredFieldValidator>

                        <asp:RangeValidator ID="valVisitDate" runat="server" ControlToValidate="txtVisitDate" ErrorMessage="Please enter a valid visit date."

                            MaximumValue="1/1/2200" MinimumValue="1/1/1950" SetFocusOnError="True" Type="Date" ValidationGroup="valGrpVisit">*</asp:RangeValidator></td>

                            

                <td><asp:TextBox ID="txtVisitDate" runat="server" CssClass="txt" MaxLength="10" /></td>

                        

                       <td> <asp:Label ID="lblEvaluationType" runat="server" AssociatedControlID="ddlEvaluationType" Text="Evaluation Type:" CssClass="lbl" /></td>

                        

                    <td><asp:DropDownList ID="ddlEvaluationType" runat="server" CssClass="ddl" DataSourceID="SqlDataSource1" DataTextField="EvaluationType" DataValueField="EvaluationID" />

                    

                     <asp:RequiredFieldValidator ID="valEvaluationType" runat="server" ControlToValidate="ddlEvaluationType"

                        ErrorMessage="Please enter the type of evaluation." SetFocusOnError="True" ValidationGroup="valGrpEvaluation">*</asp:RequiredFieldValidator></td>

                    

                       <td> <asp:Button ID="btnAdd" runat="server" Text="Add Visit" ValidationGroup="valGrpEvalution" />

                </td>

            </tr>

                <tr>

                    <td>&nbsp;</td>

                    <td colspan="4"><asp:Label ID="Label1" runat="server" Text="(mm/dd/yyyy)" ForeColor="graytext" /></td>

                </tr>           

        </table>

    </fieldset>

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Question by:Romacali
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LVL 6

Expert Comment

by:ViceroyFizzlebottom
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It looks like you have references to two versions of System.Web.Extensions.dll. Add an explicit reference in your project to the 3.5 version of that .dll.
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Author Comment

by:Romacali
Comment Utility
where do I check this?
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LVL 6

Expert Comment

by:ViceroyFizzlebottom
Comment Utility
In your project, there should be a folder called "References". Expand that folder and look for System.Web.Extensions. If that reference is there, delete it and add a new one by right clicking the References folder and selecting, "Add New Reference."

When the dialog window opens up, scroll down to System.Web.Extensions and make sure the version # is 3.5 (this will show up next to the file name.)

That should work for you.
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LVL 6

Expert Comment

by:ViceroyFizzlebottom
Comment Utility
P.S. If that reference isn't there, just continue adding the new reference as stated above, and you should be good.
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Author Comment

by:Romacali
Comment Utility
I don't have a folder called references. I'm pretty lost
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LVL 6

Expert Comment

by:ViceroyFizzlebottom
Comment Utility
Ok, that's fine. Try right clicking on the project itself then. The option to add a reference is there also. By doing that, it will create the references folder for you.
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Author Comment

by:Romacali
Comment Utility
the version when I click on System.Web.Extensions is 1.0.6.1025.0

what should I do?
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LVL 6

Expert Comment

by:ViceroyFizzlebottom
Comment Utility
If there is a version 3.5 there, double click it to add the reference. If the v3.5 is grayed out, it means your project is target to .NET v2.0.

To upgrade the target version, right click on the project and select "Property Pages". Go to the Build section and change the Target Framework to .NET Framework 3.5.
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Author Comment

by:Romacali
Comment Utility
I keep getting this error:
could not load file or assembly 'system core, Version= 3.5.0.0, Culture=neutral, Public KeyToken= b77a5c561934e89

any idea?
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LVL 6

Accepted Solution

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ViceroyFizzlebottom earned 500 total points
Comment Utility
Not sure what's going on there. You may want to try re-installing the .NET framework 3.5 and see if that helps. Unfortunately with the limited information regarding your environment, the project you're using, etc. it's really hard to diagnose.

If I was in this situation, I'd try to just get back to square one. Reinstall the 3.5 framework, create a brand new Web Project and make sure that the empty project builds correctly targeted at the 3.5 framework. If everything is fine at that point, I would start to add back in pieces of the project you're having trouble with now and make sure that the build doesn't break after each piece. If it does, you'll have narrowed down the culprit to just the last piece you brought in.
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