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0x800a138f - JavaScript runtime error: Unable to get property 'value' of undefined or null reference

Hi Experts
i am using Obout component Master and Detail grid, and its working perfectly in ASP.net Web site, recently i created ASP.net Web Application using the same functionality from web site, and its working when i try to add record in the master grid, but when i try to add a record in the detail grid i am getting an error

0x800a138f - JavaScript runtime error: Unable to get property 'value' of undefined or null reference

when adding record in in detail grid i am taking CPRNo from grid as a default number using this javascrip function

 function onPopulateControls(sender, record) {
            record.cprno = sender.ForeignKeys.cprno.value;

            return record;
        }

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this function was working in ASP.Net web site but ASP.net web application its giving me an error

the content of aspx page

<Obout:Grid ID="Grid1" runat="server" DataSourceID="SqlDataSource1" >
            <MasterDetailSettings LoadingMode="OnCallback" ShowEmptyDetails="true"/>
            <DetailGrids>
                <Obout:DetailGrid ID="Grid2" runat="server" DataSourceID="SqlDataSource2" ForeignKeys="cprno" AutoGenerateColumns="false" >
                   <ClientSideEvents ExposeSender="true" OnClientPopulateControls="onPopulateControls" />
                    <Columns>
                        <obout:Column DataField="cprno" HeaderText="cprno" ReadOnly="true" Visible="false"></obout:Column>                        
                        <obout:Column DataField="CarNo" HeaderText="CarNo" Width="100"></obout:Column>
                        <obout:Column DataField="CarColor" HeaderText="CarColor" Width="100"></obout:Column>
                        <obout:Column DataField="Company" HeaderText="Company" Width="200"></obout:Column>                        
                        <obout:Column DataField="" HeaderText="" AllowEdit="true" AllowDelete="true" Width="100" Align="center"></obout:Column>
                    </Columns>
                    <MasterDetailSettings LoadingMode="OnCallback"  />
                    </Obout:DetailGrid>
                </DetailGrids>
        </Obout:Grid>

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note that i am using Foreign Key CPRNo
i tried to contact Obout support team but i am not getting any reply, i think this company stooped
Obout

please help me

ASKER CERTIFIED SOLUTION

Bob Learned

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AZZA-KHAMEES

ASKER

thank you for the reply
the null is the value of cprno

sender.ForeignKeys.cprno.Value

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Bob Learned

I wonder if it is case-sensitive, and it should be CPRNo instead of cprno...

AZZA-KHAMEES

ASKER

no its not
i tried to remove .Value and it work but it return empty value

my major question is, why that the application was working fine when it was ASP.net web site and when i changed it to ASP.net web application i am getting this error?

Bob Learned

That is the question of the day...how did you change from Web Site model to Web Application model? Did the process change anything in the web.config?

AZZA-KHAMEES

ASKER

i created a new web application and then i modified the pages by adding the same functionality.

Bob Learned

What version of Visual Studio are you using? There is a menu option for converting a Web Site project to a Web Application project.

AZZA-KHAMEES

ASKER

i am using Visual studio 2012

Bob Learned

I believe that 2012 should have that option. Do you still have the Web Site model code base?