i need comments on the code example: int x; // declare x and life cycle VB Code Imports System Imports System.Collections.Generic Imports System.ComponentModel Imports System.Data Imports...

i need comments on the code example: int x; // declare x

and life cycle

VB Code

Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Linq
Imports System.Text
Imports System.Threading.Tasks
Imports System.Windows.Forms

Namespace Student
Public Partial Class Form1
Inherits Form

Public Sub New()
InitializeComponent()
End Sub

Private Sub btnCalculatePerc_Click(ByVal sender As Object, ByVal e As EventArgs)
txtPercentage.Text = ((Convert.ToInt32(txtMark1.Text) + Convert.ToInt32(txtMark2.Text) + Convert.ToInt32(txtMark3.Text)) / 3).ToString()
End Sub

Private Sub btnDisplayGrade_Click(ByVal sender As Object, ByVal e As EventArgs)
If Convert.ToDouble(txtPercentage.Text) >= 80 Then
txtLevel.Text = "Excellent"
ElseIf Convert.ToDouble(txtPercentage.Text) >= 70 AndAlso Convert.ToDouble(txtPercentage.Text) <= 79="">
txtLevel.Text = "Very Good"
ElseIf Convert.ToDouble(txtPercentage.Text) >= 60 AndAlso Convert.ToDouble(txtPercentage.Text) <= 69="">
txtLevel.Text = "Good"
ElseIf Convert.ToDouble(txtPercentage.Text) >= 50 AndAlso Convert.ToDouble(txtPercentage.Text) <= 59="">
txtLevel.Text = "Satisfactory"
ElseIf Convert.ToDouble(txtPercentage.Text) < 50="">
txtLevel.Text = "Fail"
End If
End Sub
End Class
End Namespace