c# - Error establishing connection to SQL Server -

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For the first time, I have started making a local database in Visual Studio and I have a hard time trying to do this work.

I tested in a modified connection and it works and it also gets the string of connections: 

  string ConnectionString = @ "data Source = D: \ bratulescu mihai \ WindowsFormsApplication1 \ WindowsFormsApplication1 \ NodeBDatabase.sdf "; SqlConn = New SqlConnection (connection string); sqlConn.Open ();   
 But when it tries to open () it can not connect. I do not know a lot about this whole server thing, I've just made DB and this is a dataset.   
 
 
 If you are using  sql , then I think that If you are reverting the  sdf  file, you should add a reference to  System.Data.SqlServerCe  and try:  
  System Using Data.SqlServerCe; .... sqlConn = new SqlCeConnection (connection string); sqlConn.Open ();

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