Update gridview editable changes to dataset inturn to a sql table

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ASP.NET

Gridview

Here is my .aspx page

<form id="form1"  runat="server">
    <div>
    <asp:GridView ID="GV" runat="server"  AutoGenerateColumns="false">
    <Columns>
    <asp:TemplateField HeaderText="Name">
    <ItemTemplate >
    <asp:TextBox ID="txtName" runat="server" Text='<%#Eval("Name") %>'></asp:TextBox>
    </ItemTemplate>
    </asp:TemplateField>
    <asp:BoundField DataField="EmailId" HeaderText="Email" />
    </Columns>
    </asp:GridView>
    
    </div>
    <asp:Button ID="btnSave" runat="server" Text="Save" />
  
    </form>

Now i am binding it from code behind on page load as given below

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

       If Page.IsPostBack Then

           Dim str As String = ConfigurationManager.AppSettings("DBConn")
           Dim Conn As New SqlConnection(str)
           Conn.Open()
           Dim qry As String = "SELECT * FROM dbo.Employee"
           Dim adp As New SqlDataAdapter(qry, Conn)
           Dim ds As New DataSet
           adp.Fill(ds)

           GV.DataSource = ds
           GV.DataBind()

       End If
   End Sub

Now I have textbox as a editable field and user will make the changes to those textboxes

and What i want is after click of a save button those changes to be updated in dataset and further in sql Employee table

Without any kind of loop

Please suggest