using (SqlConnection objCS = DB.LMSAdminConn())
{
    objCS.Open();
    SqlCommand objCommand = new SqlCommand("SELECT TOP 1 * FROM users WHERE userid = @userid", objCS);
    objCommand.Parameters.Add("@revisionid", SqlDbType.Int).Value = userid;
    SqlDataReader reader = objCommand.ExecuteReader();
    while (reader.Read())
    {
        //do something
    }
    reader.Close();
}

public static SqlConnection LMSAdminConn()
{
    return new SqlConnection(ConfigurationManager.ConnectionStrings["lmsadmin"].ToString());
}