Using Built In SQL File in Visual Studio 2012

Question

I am creating a windows application using Visual Studio 2012 and using its built in SQL Server, I have created the database and tables but unable to access the database. I am trying to insert values in tables using insert query but it is showing error Ünable to connect to server

The connection string that I am using is

    <connectionStrings>
        <add     name="GRTU_Library_Management.Properties.Settings.GRTU_Library_ManagementConnectionString"
        connectionString="Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|    \GRTU_Library_Management.mdf;Integrated Security=True"
            providerName="System.Data.SqlClient" />
    </connectionStrings>

and the query that I am trying is

SqlConnection con = new SqlConnection("GRTU_Library_Management.Properties.Settings.GRTU_Library_ManagementConnectionString");

        con.Open();
        SqlCommand cmd = new SqlCommand("insert into Category values('" + txtcategory.Text + "')", con);
            cmd.ExecuteNonQuery();
            con.Close();

please help me in this regard,

Thanks in Advance

Answer 1

There's no constructor of the SqlConnection class that accepts the name of a connection string.

If you want to retrieve a connection string from a config file, you have to do it yourself, maybe via the ConfigurationManager.ConnectionStrings .

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["GRTU_Library_Management.Properties.Settings.GRTU_Library_ManagementConnectionString"].ConnectionString);