login and update sql database using vb.net

Question

 Dim conn As MySqlConnection

        conn = New MySqlConnection()

        conn.ConnectionString = "Server=localhost;User Id=root;Passsword=;Database=voting "

        Try

            conn.Open()

        Catch myerror As MySqlException

            MsgBox("error")

        End Try

        Dim myAdapter As New MySqlDataAdapter

        Dim myCommand As New MySqlCommand()

        myCommand.Connection = conn

        

        myAdapter.SelectCommand = myCommand

       

        If Textuser.Text = "" And Textpass.Text = "" Then

            MsgBox("invalid")

        ElseIf myCommand.CommandText = "SELECT * FROM tbl_elemvoters WHERE Username = '" + Textuser.Text + "' AND VoterID='" + Textpass.Text + "UPDATE Voted='" + "Yes"

                Form2.Show()

                Me.Hide()