dynamically update entity

I dont think it's possible. you have to manually update the entity model for the new column.

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i need to update it dynamically

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I am not sure about the dynamic way. You can follow below links:

http://stackoverflow.com/questions/9708189/how-do-you-update-an-edmx-file-with-database-changes

https://msdn.microsoft.com/en-us/library/cc716697(v=vs.100).aspx

http://ihatethissite.com/blog/2011/02/25/updating-entity-framework-edmx-when-changes-are-made-to-the-database/

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