gridview OnRowCommand edit update row in c#

Question

inside grid view row command on row command edit update 

i want when edit button click then edit button hide and save button visible true

 

 

<asp:TemplateField HeaderText="Edit">

<EditItemTemplate>

<asp:LinkButton ID="save" runat="server" CommandName="save1" Text="save" CommandArgument='<%# Eval("orderId") %>'></asp:LinkButton>

</EditItemTemplate>

<ItemTemplate>

<asp:LinkButton ID="edit" runat="server" CommandName="edit1" Text="edit"></asp:LinkButton>

</ItemTemplate>

</asp:TemplateField>

 

 

and code

 

 

protected void GridClose_RowCommand(object sender, GridViewCommandEventArgs e)

{

if (e.CommandName == "edit1")

{

GridViewRow row = (GridViewRow)(((Control)e.CommandSource).NamingContainer);

TextBox txt_tracking_num = row.FindControl("txt_tracking_num") as TextBox;

DropDownList dropdwnlist = row.FindControl("dropdwnlist") as DropDownList;

LinkButton lnksave = row.FindControl("save") as LinkButton;

LinkButton edit = row.FindControl("edit") as LinkButton;

txt_tracking_num.Visible = true;

dropdwnlist.Visible = true;

lnksave.Visible = true;

}

 

 lnksave.Visible = true;

 

this is not valid show in error