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I am using ODP.NET. I have added an ADO.NET model to the project. That way, an edmx file was created. I chose "create from database" and after I selected the tables and click finish, edmx design surface appeared empty, however, the model browser window showed my added tables.
The problem now is that I cannot drag & drop the tables from model browser to the design surface. Please see this screenshot:
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edmx file open in Visual Studio, you should be able to simply right-click on a table or a column in the table and choose 'rename'. Once you change the name it will be reflected in the Mapping Details window. Problem is that's editing the entity names and properties, not the underlying SQL tables and columns.
To add new table mapping, you need to add new entity to .edmx designer by right clicking on .edmx designer and choosing the option to add new entity from the menu as shown below :
As we know that .edmx designer entity framework mapping is generated either from ‘Database First Approach’ or from ‘Model First Approach’ (in case ‘Code First Approach’ there is no .edmx designer file generated ). In these cases, EF Designer .edmx corresponds to ORM mapping to database tables.
In the Model Browser, right-click the.edmx file and select Update Model from Database. Expand the Tables, Views, and Stored Procedures nodes, and check the objects you want to add to the.edmx file. Click the Add tab. Nodes for tables, views, and stored procedures are displayed.
To open the Model Browser, right click the empty surface of the EDM designer and select Model Browser from the context menu. Model Browser will appear in the area where you normally find Solution Explorer and Properties.
Might be because of the below reasons:
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