Passing variable to ComboBox method - vb.net

Question

I have a variable that is being passed from my first form, to my second form. However, when I try to use this variable inside my ComboBox event handler method, it's showing up blank and I can't figure out why.
Public CellValue As String
Public Sub New(ByVal CellValue As String)
InitializeComponent()
MsgBox(CellValue)
End Sub
This works just fine, I am able to bring up the messagebox with the Cell Value. However, when I try to access this CellValue in my combo box method that is on the same Form, the variable is blank, and I can't figure out why.
Public Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
MsgBox(CellValue)
End Sub
I've tried putting the "ByVal CellValue As String" as an argument in the combobox but that does not work, I get an error that it can not handle the event.
I have the variable set as public so I don't understand what is going on. Any help in the right direction would be great because I have been searching the net for hours.
Here is the Form1 if that helps:
Imports MySql.Data.MySqlClient
Public Class Form1
Dim MysqlConn As MySqlConnection
Dim COMMAND As MySqlCommand
Dim value As String
Private Sub Label1_Click(sender As Object, e As EventArgs) Handles Label1.Click
End Sub
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
MysqlConn = New MySqlConnection
MysqlConn.ConnectionString = "server=0.0.0.0;
userid=username;
password=******;
database=password"
Dim SDA As New MySqlDataAdapter
Dim dbDataSet As New DataTable
Dim bSource As New BindingSource
Try
MysqlConn.Open()
Dim Query As String
Query = "select CaseNumber, FirstName, LastName from customer"
COMMAND = New MySqlCommand(Query, MysqlConn)
SDA.SelectCommand = COMMAND
SDA.Fill(dbDataSet)
bSource.DataSource = dbDataSet
DataGridView1.DataSource = bSource
SDA.Update(dbDataSet)
MysqlConn.Close()
Catch ex As MySqlException
MessageBox.Show(ex.Message)
Finally
MysqlConn.Dispose()
End Try
End Sub
Public Sub DataGridView1_CellContentClick(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
If e.ColumnIndex = 0 Then
Dim CellValue As Object = DataGridView1.Rows(e.RowIndex).Cells(e.ColumnIndex).Value
If IsDBNull(value) Then
MsgBox("No Case Number for this particular record.")
Else
Dim ThirdForm As New Form2(CellValue)
Me.Hide()
ThirdForm.Show()
End If
End If
End Sub
End Class

Answer 1

The following worked for me thanks to Plutonix in comment section. Thank you.
Me.CellValue = CellValue