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SqlDataReader is not working - does not read data

Posted on 2013-11-13
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Last Modified: 2013-11-18
When I debug it, it pass the loop while(readerOne.Read()). It never enter into this loop even though there is data.
What am I missing?  Hopefully, I can get some assistance soon.  It appears no one is out there because of no attention to my previous posts. I deleted them because I eventually find a solution on stackoverflow.

SqlDataReader does not data - does not read data

When I run the SQL statement from SQL Server - a result set is returned.
ID             UserName              PerLevel
1      US\\nathanm      1

sql string in debug
"select * from PermissionLevel where username = 'US\\nathanm'"

           
protected int getdata(string username)
        {
            int permissionlevel = 0;
                                   
            SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["MyTestDbConnectionString"].ConnectionString);
     

            string sql = "select * from PermissionLevel where username = '" + username + "'";
            SqlCommand sc = new SqlCommand(sql,conn);
            sc.CommandType = System.Data.CommandType.Text;
            conn.Open();

            SqlDataReader rdr = sc.ExecuteReader();
           
             while (rdr.Read())
            {
                permissionlevel = rdr.GetInt16(2);            
            }
            rdr.Close();
            conn.Close();
            return permissionlevel;
        }
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Question by:cookiejar
2 Comments
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 500 total points
ID: 39647150
Check that you are passing the correct number of backslashes in your username. It is difficult to tell how many slashes you have in the actual value (since backslash is the escape character in C# strings).
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Author Comment

by:cookiejar
ID: 39648615
There are two backslashes.  If I remove the where clause, it works fine.
From researching on line, I tried parametizing but it still doesn't work.  

protected int getdata(string username)
        {
            int permissionlevel = 0;
                                   
            SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["MyTestDbConnectionString"].ConnectionString);

               string sql = "select * from PermissionLevel where UserName= @user";
            SqlCommand sc = new SqlCommand(sql,conn);
            sc.Parameters.AddWithValue("@user", username);
            sc.CommandType = System.Data.CommandType.Text;
            conn.Open();

            SqlDataReader rdr = sc.ExecuteReader();
                   
             while (rdr.Read())
            {
                permissionlevel = rdr.GetInt32(2);            
            }
            rdr.Close();
            conn.Close();
            return permissionlevel;
        }
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