c# - Can't use SQL Server CE in VS2012 -

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i'm developing web application , trying use local database file store information. however, when add .sdf file, error. below screenshots detailing problem.

i've been trying figure what's wrong several hours. i've seen similar issues, have yet find fix. used able use sqlserverce connections before .sdf files, though different development environment. have tried reinstalling sql several times, including downloading find on msdn. can me out?

below solution explorer view. i've added database1.sdf project.

solution explorer view.

i error add it:

error message

if try open .sdf file, error:

error message 2

here list of references:

references

and, finally, of relevant sql-related installations on local machine:

sql installations

sql server compact 4.0 supported vs 2012, requires ddex provider isntalled. sounds vs install somehow broken. can install toolbox add-in, , go dialog in toolbox check if ddex provider , sql server ce 4.0 installed.


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