Why can't I get subs to handle if statements based on a class-level boolean?

See more:

VB

In my vb.net winforms project, I have a sub in my form class that I want to exit without doing anything if a certain flag boolean variable (flagDataLoading) is true. But it proceeds to run the contents of the if statement. Why is it doing this?

Imports System.Configuration
Imports System.Data.SqlClient
Public Class Form1
    Private flagDataLoading As Boolean = True
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        DataGridView1.DataSource = GetTestTable()
        flagDataLoading = False

    End Sub
    Private Function GetTestTable()
        Dim dtTest As New DataTable
        Dim connString As String = ConfigurationManager.ConnectionStrings("dbx").ConnectionString
        Using conn As New SqlConnection(connString)
            Using cmd As New SqlCommand("SELECT * FROM dbo.testTable", conn)
                conn.Open()
                Dim reader As SqlDataReader = cmd.ExecuteReader
                dtTest.Load(reader)
            End Using
        End Using
        Return dtTest
    End Function



    Private Sub DataGridView1_RowEnter(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.RowEnter
        If flagDataLoading = False Then ' If the GridView is not still doing its initial load of data from the database table(if the row entry is coming from the database, then it's already saved there.)
            Dim reply As DialogResult = MessageBox.Show("Save the current record?", "Question:", MessageBoxButtons.YesNo)
            If reply = DialogResult.Yes Then
                Dim connectionString As String = "Data Source=(localdb)\ProjectModels;Initial Catalog=master;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"
                Using conn As New SqlConnection(connectionString)
                    conn.Open()

                    Dim insertSql As String = "INSERT INTO dbo.testTable(testColumn) VALUES (@value)"
                    Using transaction As SqlTransaction = conn.BeginTransaction
                        Try
                            For Each row As DataGridViewRow In DataGridView1.Rows
                                If Not row.IsNewRow Then
                                    Using cmd As New SqlCommand(insertSql, conn, transaction)
                                        cmd.Parameters.AddWithValue("value", row.Cells("column1").Value)
                                        cmd.ExecuteNonQuery()
                                    End Using
                                End If
                            Next
                        Catch ex As Exception

                        End Try
                    End Using
                End Using
            Else
                Return
            End If

        End If

    End Sub

End Class

The sub DataGridView1_RowEnter is supposed to prompt the user whether or not to save any entered rows, but it would do this for every existing record from the database during the Form1_Load sub, so I put it in the If statement. flagDataLoading is supposed to indicate whether or not the data grid is still being populated with the data from the database table.

What I have tried:

If I break before the if statement, it shows that the boolean is true, so not false, meaning the if statement should not run, but it is.