GridView

I have my gridview's autogenerateeditbutton=true. I want to make it so when the user clicks on the edit button they will be redirected to a new page. I've been searching the msdn pages to find the code to redirect to a new page and I get this as an example:
ID="Button1"
PostBackUrl="~/TargetPage.aspx"
runat="server"
Text="Submit" />
But It seems the only way to access the autogenerated edit button is through gridview's event:
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)

How do i redirect to a new page in the event code?
Thanks