4 code audit queries

[OSVBNET]

Hello, just have few very quick questions, please help

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1. Which one is better and recommended to use?

Dim MySel As String = Convert.ToString (ComboBox.SelectedIndex + 1)
or
Dim MySel As String = (ComboBox.SelectedIndex + 1).ToString

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How to correct the following codes?

2.

Me.Tag = Me.Tag + "\"
Option Strict On prohibits operands of type Object for operator '+'

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3.

Dim MyCounter As OleDbDataReader = CountUser.ExecuteReader
MyCounter.Read()
If MyCounter(0) = 0 Then ...
Option Strict On disallows operands of type Object for operator '='. Use the 'Is' operator to test for object identity.

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4.

Private Delegate Function QuestionBoxHandler(ByVal Message As String)
Private Function ShowQuestionBox(ByVal Message As String)
Option Strict On requires all Function, Property, and Operator declarations to have an 'As' clause.

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