How do I display database data on labels for that particular user?

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I have tried displaying but it seems to have a problem.
Please help me find out the problem.

What I have tried:

C#

public void getQuestionOne()
        {
            string MYDBConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["MYDBConnection"].ConnectionString;
            SqlConnection con = new SqlConnection(MYDBConnectionString);

            con.Open();
            string sql = "select question1, question2 from Customer where username=@UserID";
            SqlCommand cmd = new SqlCommand(sql, con);
            try
            {

                using (SqlDataReader read = cmd.ExecuteReader())
                {
                    while (read.Read())
                    {
                        lblqnsOne.Text = (read["question1"].ToString());
                        lblqnsTwo.Text = (read["question2"].ToString());

                    }
                }
            }
            finally
            {
                con.Close();
            }
        }

Posted 28-Jul-18 20:20pm

Lynn Lee

Updated 29-Jul-18 7:07am

Nelek

v2

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Vincent Maverick Durano · Answer 1 · 2018-07-29T05:03:00

One obvious reason why your code isn't working because you haven't assigned the parameter @UserID in your SQL query. To fix that, you can do something like this:

C#

private void GetQuestionOne(int userID){
     	String strConnString = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;
            using(SqlConnection con = new SqlConnection(strConnString)){
            	using(SqlCommand cmd = new SqlCommand("SELECT question1, question2 from Customer where username=@UserID", con)){
			        con.Open();
                    cmd.Parameters.AddWithValue("@UserID", userID);
            		using (SqlDataReader read = cmd.ExecuteReader())
                        {
                            while (read.Read())
                            {
                                lblqnsOne.Text = read["question1"].ToString();
                                lblqnsTwo.Text = read["question2"].ToString();

                            }
                        }
	    	}
	    }
}

Tip: Make it a habit to put objects that eat resources such as SqlConnection, SqlCommand, SqlDataAdapter, SqlDataReader within a using statement to ensure that objects will be properly disposed and closed after they are used.