Data cannot be updated from the EditItem template in database page

[SpottyBlue]

Can help? When in debugging mode of the database page (Database.aspx), I try to update the details by modifying the fields in the EditItem template. But then, when I click "Update", the data cannot be updated and shows the error message: "Data could not be updated. Please try again."

This is the most common issue in my project. Is there a way to fix this problem?

Project zip file: https://drive.google.com/file/d/0B07_pOHhTox3Ql9kZ0dyUjZqRWc/view?usp=sharing -> Open Database.aspx from Admin folder
MDF files (required to connect): https://drive.google.com/file/d/0B07_pOHhTox3WDNRY21fRVpFT1k/view?usp=sharing

[hericles]

"Data could not be updated. Please try again" sounds like it is an error message coming from your own code. If it is being generated via a try/catch block then catch the actual error text of the exception and have a look at that. It will provide real information on why it is failing.

[SpottyBlue]

Can help me check whether there is something wrong with my code?

Source code segement from the file:

<UpdateParameters>
    <asp:Parameter Name="_AppTypeName" />
    <asp:Parameter Name="_preferredName" />
    <asp:Parameter Name="_designation" />
    <asp:Parameter Name="_OfficeName" />
    <asp:Parameter Name="_floorNo" />
    <asp:Parameter Name="_DeptName" />
    <asp:Parameter Name="_deptExtNo" />
    <asp:Parameter Name="_projectType" />
    <asp:Parameter Name="_otherProjectName" />
    <asp:Parameter Name="_EmailID" />
    <asp:Parameter Name="_EmailGroup" />
    <asp:Parameter Name="_EmailGroupName" />
    <asp:Parameter Name="_emailDiversionType" />
    <asp:Parameter Name="_emailDiversionAdd" />
    <asp:Parameter Name="_IntAccess" />
    <asp:Parameter Name="_nsf" />
    <asp:Parameter Name="_loanComp" />
    <asp:Parameter Name="_remarks" />
    <asp:Parameter Name="original_name" />
</UpdateParameters>