is this code is corerct to retrive the data into text box

use reader.close() and con.close() outside the if condition

public string user(AddInfoModel info)
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["MyConsString"].ConnectionString);
con.Open();
SqlCommand cmd = new SqlCommand("Resource_sp", con);
cmd.CommandType = CommandType.StoredProcedure;
SqlDataReader reader = cmd.ExecuteReader();
if (reader.Read())
{

FirstName.Text = reader["FirstName"].ToString();
LastName.Text = reader["LastName"].ToString();

}
reader.Close();
con.Close();

}
}
}