Question

Im newbie in C#

I put my database connection to a class:

public class Connection
{
    public string SetConnection()
    {
        string connectionstring = "server=SURI-PC;database=cms;Integrated Security=True";
        return connectionstring;
    }
}

then, I call it in main class:

public static void Main(string[] args)
{
    Connection conObject = new Connection();
    SqlConnection scon = new SqlConnection(conObject.SetConnection());
    String sql = "insert into category(cat_id, cat_name) values('C03', 'Browser')";
    SqlCommand cmd = new SqlCommand(sql, scon);
    cmd.ExecuteNonQuery();
}

But it isnt work.

How to create a connection class and call it in others class?

Please help me!

thanks.

Answer 1

Yeah like zenwalker said, there is no scon.Open() which you need to open the connection to the database. Also it’s better practice to use a using-block when you open the connection like this

using(SqlConnection scon = new SqlConnection(conObject.SetConnection())) {
    scon.Open();
    String sql = "insert into category(cat_id, cat_name) values('C03', 'Browser')";
    SqlCommand cmd = new SqlCommand(sql, scon);
    cmd.ExecuteNonQuery();
}

Also see here for more information about the SqlConnection.