Login script using remote database

conn = New MySqlConnection()
        conn.ConnectionString = "server=SERVER URL or IP; user id=DATABASE USER; password=DB PASS; database=DATABASE NAME"
        Try
            conn.Open()
        Catch myerror As MySqlException
            MsgBox("Error attempting to connect to server. The Mark M Server may be down.")
            Me.Close()
        End Try

Dim myAdapter As New MySqlDataAdapter
                Dim sqlquery = "SELECT * FROM TABLE_HERE WHERE USERNAME_FIELD_HERE='" + TextBox1.Text + "' AND PASSWORD_FIELD_HERE'" + TextBox2.Text + "'"
                Dim myCommand As New MySqlCommand()
                myCommand.Connection = conn
                myCommand.CommandText = sqlquery
                'start query
                myAdapter.SelectCommand = myCommand
                Dim myData As MySqlDataReader
                myData = myCommand.ExecuteReader()
                'see if user exits.
                If myData.HasRows = 0 Then
                    conn.Close()
                    conn.Open()
                    MsgBox("Wrong username or Password", MsgBoxStyle.Critical, "Error")
                Else
                    Main.Show()
                    Me.Close()
                End If
            End If