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    <p>If you right-click in the EDMX editor, there should be an option to "Update Model from Database." If you have removed fields in the database, you may still need to remove them, or even remove their table and re-add it via the "Update Model from Database" menu, but I find this much easier than deleting the whole edmx and starting fresh each time.</p> <p><strong>Update</strong></p> <p>As Ladislav says, you should never mess with auto-generated code files. As you have discovered, those code files get rewritten automatically. The creators of Entity Framework foresaw the issue you're having, and they provided a mechanism whereby you can add to those classes without modifying the auto-generated .cs file: <em>partial classes</em>.</p> <p>Partial classes allow you to create class definitions that span multiple files, provided they are all in the same namespace and assembly. So alongside the autogenerated Context.cs file, you can create additional files like this:</p> <blockquote> <p>Book.cs</p> </blockquote> <pre><code>[MetadataType(typeof(Books_validation))] public partial class Book { public bool IsManagedBy(string userName) { return ManagedBy.Equals(userName, StringComparison.OrdinalIgnoreCase); } } </code></pre> <p>The presence of this separate definition of the partial class will cause this code to be effectively "merged" with the auto-generated Book class when the assembly is compiled, but it allows you to have this special custom code in a separate file which won't be affected when you regenerate the model data from the EDMX file.</p>
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    1. COi tried to remove a field from a Data base table then i use the "Update Model from Database" and i select the table which I had modified, but i noted that the visual studio has recreated the model class which represents the modified table and all the classes that are connected to this table by FK relation and also all the data annotation and helper methods which i created inside the classes under the .tt folder were removed... so how i can avoid these two problems (affecting the other tables & keeping the data annotation and the helper methods). BR
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    2. CO@johnG: I've read your comments a few times over, and I'm afraid I don't understand what you're saying. How is it affecting other tables? What helper methods are you losing? Please update your question with some code to show some examples of what you're talking about.
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    3. COthanks StriplingWarrior,, i have edited my post to make it clearer. BR
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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