How Do I Update A Gridview's Row From An External Update Button

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C#

ASP.NET

XML

hello, i'm new to asp.net so please bare with me

so far i have a grid view bound to an xml data source, when the user clicks on edit on whatever row it will open up a new view, this view holds 3 text boxes. Each textbox is populated with the selected row's data.

my question is how can i update the value of the gridview's row by clinking on the "update" button located in this view

the view in the aspx file :

<asp:View ID="edit" runat="server" >

id	<asp:TextBox ID="editid" runat="server" >
name	<asp:TextBox ID="editname" runat="server" >
info	<asp:TextBox ID="editinfo" runat="server" >

<asp:Button Text="update" ID="update" runat="server" OnClick="update_Click" />




linked it with the gridview when the user clicks on edit.


code behind file :

protected void gv1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "eddit")
{
//view 2 used for editing and updating

MultiView1.ActiveViewIndex = 2;
GridViewRow row = (GridViewRow)((Control)e.CommandSource).Parent.Parent;
//linked my textboxes to the labels in the gridview
editid.Text = (row.FindControl("labelid") as Label).Text;
editname.Text = (row.FindControl("labelname") as Label).Text;
editinfo.Text = (row.FindControl("labelinfo") as Label).Text;


}
}


how do i save the values i typed in the text boxes to the gridview's selected row or save it to the xml file?

protected void update_Click(object sender, EventArgs e)
{
// i want to add some code here to update the values from the textbox to the selected row. is this possible
}


i'm sorry for the stupid question but i am at a loss.

thank you very much for your help, and please bare with me i am a beginner in this