Connecting to local SQL Server database using C

Question

Suppose I have created a SQL Server database called Database1 mdf in the App Data folder in Visual Studio with a table called Names    How could I establish a connection to read the table values using C    So far I ve tried something like this   SqlConnection conn   new SqlConnection  Server localhost Database Database1      conn Open        create a SqlCommand object for this connection SqlCommand command   conn CreateCommand    command CommandText    Select   from Names     But I get an error      database not found error connecting to database

User · Answer

SqlConnection c   new SqlConnection   Data Source localhost                              Initial Catalog Northwind  Integrated Security True

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I like to use the handy process outlined here to build connection strings using a  udl file   This allows you to test them from within the udl file to ensure that you can connect before you run any code   Hope that helps

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In Data Source  on the left of Visual Studio  right click on the database  then Configure Data Source With Wizard  A new window will appear  expand the Connection string  you can find the connection string in there

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You try with this string connection  Server   SQLExpress AttachDbFilename  DataDirectory Database1 mdf Database dbname  Trusted Connection Yes

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If you use SQL authentication  use this   using System Data SqlClient   SqlConnection conn   new SqlConnection    conn ConnectionString          Data Source   SQLExpress            User Instance true            User Id UserName            Password Secret            AttachDbFilename  DataDirectory Database1 mdf   conn Open      If you use Windows authentication  use this   using System Data SqlClient  SqlConnection conn   new SqlConnection    conn ConnectionString          Data Source   SQLExpress            User Instance true            Integrated Security true            AttachDbFilename  DataDirectory Database1 mdf   conn Open

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If you re using SQL Server express  change  SqlConnection conn   new SqlConnection  Server localhost              Database Database1       to  SqlConnection conn   new SqlConnection  Server localhost SQLExpress              Database Database1       That  and hundreds more connection strings can be found at http   www connectionstrings com

[c#] Connecting to local SQL Server database using C#

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