'Method Creating Xml File if does'nt Exists
Private Sub createxml()
	Dim tb As New DataTable("emptable")
	tb.Columns.Add("eno", Type.[GetType]("System.Int32"))
	tb.Columns.Add("ename", Type.[GetType]("System.String"))
	tb.Columns.Add("eadd", Type.[GetType]("System.String"))
	tb.Columns.Add("esal", Type.[GetType]("System.Int32"))
	Dim r As DataRow = tb.NewRow()
	r(0) = 1
	r(1) = "Rahul Choudhary"
	r(2) = "Chandigarh"
	r(3) = 12000
	tb.Rows.Add(r)
	Dim st As [String] = Server.MapPath("emp.xml")
	tb.WriteXml(st)
End Sub

'Method to bind Grid view
Private Sub getxml()
	Dim st As [String] = Server.MapPath("emp.xml")
	Dim ds As New DataSet()
	ds.ReadXml(st)
	GridView1.DataSource = ds
	GridView1.DataBind()
End Sub

'Grid View Event to Save Data into Xml File
Protected Sub GridView1_RowCommand(sender As Object, e As GridViewCommandEventArgs)
	If e.CommandName = "save" Then
		Dim st As [String] = Server.MapPath("emp.xml")
		Dim ds As New DataSet()
		ds.ReadXml(st)
		Dim r As DataRow = ds.Tables(0).NewRow()
		r(0) = Convert.ToInt32(DirectCast(GridView1.FooterRow.FindControl("TextBox1"), TextBox).Text)
		r(1) = DirectCast(GridView1.FooterRow.FindControl("TextBox3"), TextBox).Text
		r(2) = DirectCast(GridView1.FooterRow.FindControl("TextBox5"), TextBox).Text
		r(3) = Convert.ToInt32(DirectCast(GridView1.FooterRow.FindControl("TextBox7"), TextBox).Text)
		ds.Tables(0).Rows.Add(r)
		ds.WriteXml(st)
		getxml()
	End If
End Sub

'Grid View Row Deleting Event to Delete From Xml File
Protected Sub GridView1_RowDeleting(sender As Object, e As GridViewDeleteEventArgs)
	Dim st As [String] = Server.MapPath("emp.xml")
	Dim ds As New DataSet()
	ds.ReadXml(st)
	ds.Tables(0).Rows.RemoveAt(e.RowIndex)
	ds.WriteXml(st)
	getxml()
End Sub
Protected Sub GridView1_RowEditing(sender As Object, e As GridViewEditEventArgs)
	GridView1.EditIndex = e.NewEditIndex
	getxml()
End Sub
Protected Sub GridView1_RowCancelingEdit(sender As Object, e As GridViewCancelEditEventArgs)
	GridView1.EditIndex = -1
	getxml()
End Sub

'Grid View row Updating Event to update xml file
Protected Sub GridView1_RowUpdating(sender As Object, e As GridViewUpdateEventArgs)
	Dim st As [String] = Server.MapPath("emp.xml")
	Dim ds As New DataSet()
	ds.ReadXml(st)
	ds.Tables(0).Rows(e.RowIndex)(1) = DirectCast(GridView1.Rows(e.RowIndex).FindControl("TextBox2"), TextBox).Text
	ds.Tables(0).Rows(e.RowIndex)(2) = DirectCast(GridView1.Rows(e.RowIndex).FindControl("TextBox4"), TextBox).Text
	ds.Tables(0).Rows(e.RowIndex)(3) = Convert.ToInt32(DirectCast(GridView1.Rows(e.RowIndex).FindControl("TextBox6"), TextBox).Text)
	GridView1.EditIndex = -1
	ds.WriteXml(st)
	getxml()
End Sub

This code will be used to bind an xml file to gridview

Binding xml file to Gridview

xml, aspnet

VB.NET