ASP.NET

<asp:FormView runat="server" ID="fv" DefaultMode="Edit" DataKeyNames="id" OnItemUpdating="fv_ItemUpdating">
<EditItemTemplate>
    <asp:TextBox runat="server" ID="tb" Text='<%#Bind("name") %>' />
    <asp:Button runat="server" ID="btn" Text="Edit Inside" CommandName="Update" />
</EditItemTemplate>
</asp:FormView>

<asp:Button runat="server" ID="btn" Text="Edit Outside" OnClick="EditOutside" />

public System.Data.DataTable SomeData()
{
    System.Data.DataTable temp = new System.Data.DataTable();
    temp.Columns.Add("id");
    temp.Columns.Add("name");

    System.Data.DataRow dr = temp.NewRow();
    dr["id"] = 1;
    dr["name"] = "somebody";
    temp.Rows.Add(dr);

    dr = temp.NewRow();
    dr["id"] = 2;
    dr["name"] = "someone";
    temp.Rows.Add(dr);
    return temp;
}
protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        fv.DataSource = SomeData();
        fv.DataBind();
    }
}
public void fv_ItemUpdating(object sender, FormViewUpdateEventArgs e)
{
    string txtValue = (fv.FindControl("tb") as TextBox).Text;
}
public void EditOutside(object sender, EventArgs e)
{
    fv.UpdateItem(false);
}