[Resolved] [2005] Error using datareader with mysql

[moviejunkie]

I am making a program which requires the user to login in, it is a simple form with a username and password text boxes and a login buttion, all the user information is stored on a MySqlDatabase. I can connect and read from the database, the trouble I am having is when the user types a username that is not in the database it give me an error of "Invalid attempt to access a field before calling Read()"

HELP. Here is my code for the login button

Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
        conn.ConnectionString = sql
 
        Try
            conn.Open()
            SqlCommand.Connection = conn
            SqlCommand.CommandText = "SELECT * from users where username = ?UserName"
            SqlCommand.Parameters.Add("?UserName", txtUserName.Text)
            Dim reader As MySqlDataReader = SqlCommand.ExecuteReader
            reader.Read()
            username = reader.Item("username").ToString
            password = (DecryptText(reader.Item("password").ToString, "aaaa"))
            If txtPassword.Text = password Then
                MsgBox(username)
                CheckInAllowed = reader.Item("CheckInAllowed")
                LookAtRecord = reader.Item("LookAtRecord")
                ChangeRecord = reader.Item("ChangeRecord")
                EditUsers = reader.Item("EditUsers")
                allowexit = reader.Item("allowexit")
            Else
                MsgBox("error")
            End If
            conn.Close()
        Catch ex As MySqlException
            MessageBox.Show("Error Connecting to Database: " & ex.Message)
            Debug.Write(ex.Message)
        Finally
            conn.Dispose()
        End Try
    End Sub