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copied!<h3>Initial Hints</h3> <p>If you want to see some examples for windows forms connecting to a database i can recommend the <a href="http://msdn.microsoft.com/en-us/vstudio//bb466226.aspx#formsoverdata" rel="nofollow noreferrer">forms over data video series</a>. Video 2 is about <a href="http://msdn.microsoft.com/en-us/vstudio/bb643826" rel="nofollow noreferrer">how to connect to a database</a>. </p> <p>In the app.config file you can put your connection data</p> <pre><code><connectionStrings> <add name="OrderManager.My.MySettings.OMSConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\OMS.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient" /> </connectionStrings> </code></pre> <p>To be able to help you better i need more details. If you connect in management studio you can take a look at your connections properties. What are the values here and so on.</p> <h3>Update</h3> <p>There is <a href="https://stackoverflow.com/questions/13215172/database-connection-error-file-in-use">another question</a> with a similar problem. May be you are <a href="http://blogs.msdn.com/b/sqlexpress/archive/2006/11/22/connecting-to-sql-express-user-instances-in-management-studio.aspx" rel="nofollow noreferrer">running user instances</a>. Please add more details:</p> <ul> <li>add information about your connection string (i am assuming your are using <a href="http://msdn.microsoft.com/en-us/library/ms233763%28v=vs.80%29.aspx" rel="nofollow noreferrer">file attached connnections</a> with a <a href="http://msdn.microsoft.com/en-us/library/ms246989%28v=vs.80%29.aspx" rel="nofollow noreferrer">local data file</a>)</li> <li>where do you click on your database? Are you clicking on the mdf file or are you using management studio or visual studio</li> </ul>

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