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An exception of type 'system.data.entity.modelconfiguration.modelvalidationexception' occurred in entityframework.dll but was not handled in user code additional information: Go to.edmx in solution explorer open it and right click on page and then choose update model from database and finished it then save the file. Inner exception would be this.

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Initializes a new instance of.

Exception thrown by dbmodelbuilder during model creation when an invalid model is generated.

Exception thrown by dbmodelbuilder during model creation when an invalid model is generated. The source for this content can be found on github, where you can also create and review. System.data.sqlclient.sqlexception' occurred in entityframework.dll but was not handled in user code. You need to update data model in visual studio.

I get a modelvalidation exception in all models claiming the key is not defined. Exception thrown by dbmodelbuilder during model creation when an invalid model is generated. Make sure that you have set the auto increment attribute to 'emp_id' column in your database table, and your model should look like this: