DataSet Bug

code is below

Public Class Form1
    Private Sub ReportBindingNavigatorSaveItem_Click(sender As Object, e As EventArgs) Handles ReportBindingNavigatorSaveItem.Click
        Me.Validate()
        Me.ReportBindingSource.EndEdit()
        Me.TableAdapterManager.UpdateAll(Me.StReportDataSet)

    End Sub

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'StReportDataSet.Report' table. You can move, or remove it, as needed.
        Me.ReportTableAdapter.Fill(Me.StReportDataSet.Report)

    End Sub

    Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
        Me.ReportBindingSource.EndEdit()
        Me.ReportTableAdapter.Update(Me.StReportDataSet.Report)
    End Sub
End Class

I made form1 closing code  to save the changed data in data set. ..

Table pic

Dataset interface

After Run the program

I made changes by input 5 Row..and clicked save then close. .

Data is same as previous

Then how to do save and update the data?