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So we need more detailed information to reproduce this issue locally. Once created, the next step is to drag and drop table into the Visual Designer. You can also drag and drop stored procedure to be used.

(provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)" on Database Connection's "_connection. You then mention that VS2008 reports an error when loading this file, and that the 4 errors are in Test. Since upgrading to VS 2008 SP1, whenever I update my Linq DBML file, my Xxxx.file gets deleted by Visual Studio.This causes compilation errors as the data classes can no longer be found. Column Attribute(Storage="_Name", Db Type="NVar Char(100)")] public string Name then i added new column in database table named "Password" if i delete old diagram in dbml and drag new table, it re-writes whole something.file, so i lose all codes i wrote before. I googled it and people say about Partial class, but i dont know how to use partial class. but, like i said, I want to add [Require(Error Message="Please Type something")] on each required columns, but if i do that in partial class, it says those variables are alreadly defined in file. Here's what I do: I keep a separate class file (.cs) which was copied from I do whatever changes i required in the class file Also I do changes in my by drag&drop or remove DB objects Then I compare both the class fie and file using File Diff and update my class file according to what File Diff says Though this is a little tedious, but I am happy that I have control over my Data Context ... The moment you drag & drop db objects into ORD GUI the file is automatically updated Just you create separate class file (filename.cs) Name of the class in the class file as below: should be something like the class name in your designer file Thank you very much! So, like you said, i make public partial class User in file.

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