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troubleshooting Question

ASP.NET C# Datareader loop problem

Avatar of thomasmutton
thomasmuttonFlag for United Kingdom of Great Britain and Northern Ireland asked on
ASP.NET
5 Comments1 Solution313 ViewsLast Modified:
Hello,

i am trying to make my own membership system in asp.net 2.0 c# (i am using MY SQL)

public void btnSignUp_OnClick(object sender, EventArgs e)
      {
            // CREATE THE CONNECTION
            MySqlConnection con = new MySqlConnection(connectionString);
            try
            {
                  // CREATE THE COMMAND
                  string sql = "SELECT * FROM tbl_user";
                  
                  // CONFIGURE THE CONNECTION
                  MySqlCommand cmd = new MySqlCommand(sql, con);
                  
                  // OPEN THE DATABASE CONNECTION
                  con.Open();

                  // RUN THE QUERY
                  MySqlDataReader reader = cmd.ExecuteReader();

                  // PARSE THE RESULTS
                  while (reader.Read() == true)
                  {
                        object objusername = reader["user_name"];
                        object objpassword = reader["user_password"];

                        // IF USERNAME ALREADY EXISTS
                        if (txtNewUsername.Text == objusername.ToString())
                        {
                              lblSignUpStatus.Text = "Username already taken.";
                        }      
                        

                        // IF USERNAME DOES NOT EXIST
                        if (txtNewUsername.Text != objusername.ToString())
                        {
                              lblSignUpStatus.Text = "you can use this one, its not being used.";
                        }      
                        
                  }
                  // CLOSE THE READER
                  reader.Close();
            }
            finally
            {
                  // CLOSE THE DATABASE CONNECTION
                  con.Close();
            }      
      }

when the submit button is pressed the code tried to find if the username the customer has chosen already exists in the database, if it does already exist then it will show the message "username already taken".

if the username does not exist then the customer is shown an ok message.

the problem here is that there is 2 usernames in the table and when i chose the 2nd username in the table, it shows the message that it is ok to use. if i choose the first username in the table, it wont.

if i take away this

// IF USERNAME DOES NOT EXIST
                        if (txtNewUsername.Text != objusername.ToString())
                        {
                              lblSignUpStatus.Text = "you can use this one, its not being used.";
                        }      

the problem no longer occurs, but i need the code above to validate wether the username can be used or not.

can anyone help?
thanks
ASKER CERTIFIED SOLUTION
Avatar of Edwin_C
Edwin_CFlag of Hong Kong image

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