[asp.net] keyword not supported data source

I have an asp.net-mvc application with the default membership database. I am accessing it by ADO.NET Entity Framework.

Now I want to move it to IIS, but several problems showed up. I had to install SQL Server Management Studio, Create new DB, import there all the data from the previous .MDF file. Only thing left to do (as far a I know) is to change to connection string. However, I am not really experienced with this and keep getting the Keyword not supported: 'data source'. exception. Here is my connection string:

<add name="ASPNETDBEntities" 
     connectionString="Data Source=MONTGOMERY-DEV\SQLEXPRESS;Initial Catalog=ASPNETDB;Integrated Security=True;" 
     providerName="System.Data.EntityClient" />

Any ideas, what's wrong?

This problem can occur when you reference your web.config (or app.config) connection strings by index...

var con = ConfigurationManager.ConnectionStrings[0].ConnectionString;

The zero based connection string is not always the one in your config file as it inherits others by default from further up the stack.

The recommended approaches are to access your connection by name...

var con = ConfigurationManager.ConnectionStrings["MyConnection"].ConnectionString;

or to clear the connnectionStrings element in your config file first...

<connectionStrings>
    <clear/>
    <add name="MyConnection" connectionString="...

I was getting the same problem.
but this code works good try it.

<add name="MyCon" connectionString="Server=****;initial catalog=PortalDb;user id=**;password=**;MultipleActiveResultSets=True;" providerName="System.Data.SqlClient" />

I know this is an old post but I got the same error recently so for what it's worth, here's another solution:

This is usually a connection string error, please check the format of your connection string, you can look up 'entity framework connectionstring' or follow the suggestions above.

However, in my case my connection string was fine and the error was caused by something completely different so I hope this helps someone:

1. First I had an EDMX error: there was a new database table in the EDMX and the table did not exist in my database (funny thing is the error the error was not very obvious because it was not shown in my EDMX or output window, instead it was tucked away in visual studio in the 'Error List' window under the 'Warnings'). I resolved this error by adding the missing table to my database. But, I was actually busy trying to add a stored procedure and still getting the 'datasource' error so see below how i resolved it:

2. Stored procedure error: I was trying to add a stored procedure and everytime I added it via the EDMX design window I got a 'datasource' error. The solution was to add the stored procedure as blank (I kept the stored proc name and declaration but deleted the contents of the stored proc and replaced it with 'select 1' and retried adding it to the EDMX). It worked! Presumably EF didn't like something inside my stored proc. Once I'd added the proc to EF I was then able to update the contents of the proc on my database to what I wanted it to be and it works, 'datasource' error resolved.

weirdness

I had this problem when I started using Entity Framework, it happened when I did not change the old SQL server connection to EntityFrameWork connection.

Solution: in the file where connection is made through web.config file "add name="Entities" connectionString=XYZ", make sure you are referring to the correct connection, in my case I had to do this

        public static string MyEntityFrameworkConnection
    {
        get
        {
             return ConfigurationManager.ConnectionStrings["Entities"].ConnectionString;
        }

    }

call MyEntityFrameworkConnection whenever connection need to be established.

private string strConnection= Library.DataAccessLayer.DBfile.AdoSomething.MyEntityFrameworkConnection;

note: the connection in web.config file will be generated automatically when adding Entity model to the solution.

I was getting the same error, then updated my connection string as below,

<add name="EmployeeContext" connectionString="data source=*****;initial catalog=EmployeeDB;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" />

Try this it will solve your issue.