C # Return page

Protected void page_load (Object sender, eventargs E)
{
Page. Title = dataclass. getapplication ("webname") + "-" + "system information ";
String Strid = request. querystring ["ID"];
If (! Ispostback)
{
Switch (Strid)
{
Case "1 ":
Lbl_prompt.text + = "successfully registered ";
Hlk_link.text = "back to homepage ";
Hlk_link.navigateurl = "index. aspx ";
Break;

Case "2 ":
Lbl_prompt.text + = "the user name already exists. Please reset it ";
Break;

Case "3 ":
Lbl_prompt.text + = "email already exists. Set it again ";
Break;

Case "4 ":
Lbl_prompt.text + = "the user name or password is incorrect. Please log on again ";
Hlk_link.text = "back to login page ";
Hlk_link.navigateurl = "login. aspx ";
Response. write ("<script language = 'javascript '> setTimeout (\" {location. href = 'login. aspx '} \ ", 5000); </SCRIPT> ");
Break;

Case "5 ":
Lbl_prompt.text + = "Logon successful ";
Hlk_link.text = "back to homepage ";
Hlk_link.navigateurl = "index. aspx ";
Response. write ("<script language = 'javascript '> setTimeout (\" {location. href = 'index. aspx '} \ ", 5000); </SCRIPT> ");
Break;

Case "6 ":
Lbl_prompt.text + = "you have exited safely ";
Hlk_link.text = "back to homepage ";
Hlk_link.navigateurl = "index. aspx ";
Response. write ("<script language = 'javascript '> setTimeout (\" {location. href = 'index. aspx '} \ ", 5000); </SCRIPT> ");
Break;

Case "7 ":
Lbl_prompt.text + = "you have successfully published information ";
Hlk_link.text = "back to homepage ";
Hlk_link.navigateurl = "index. aspx ";
Response. write ("<script language = 'javascript '> setTimeout (\" {location. href = 'index. aspx '} \ ", 5000); </SCRIPT> ");
Break;
Case "8 ":
Lbl_prompt.text + = "modification successful ";
Break;

Case "9 ":
Lbl_prompt.text + = "You have not logged on, please log on and use ";
Hlk_link.text = "back to login page ";
Hlk_link.navigateurl = "login. aspx ";
Response. write ("<script language = 'javascript '> setTimeout (\" {location. href = 'login. aspx '} \ ", 5000); </SCRIPT> ");
Break;

Case "10 ":
Lbl_prompt.text + = "modification successful ";
Hlk_link.text = "back to user center ";
Hlk_link.navigateurl = "usercenter. aspx ";
Response. write ("<script language = 'javascript '> setTimeout (\" {location. href = 'usercenter. aspx '} \ ", 5000); </SCRIPT> ");
Break;
Case "11 ":
Lbl_prompt.text + = "the user name or password is incorrect. Please log on again ";
Hlk_link.text = "back to login page ";
Hlk_link.navigateurl = "login. aspx ";
Response. write ("<script language = 'javascript '> setTimeout (\" {location. href = 'login. aspx '} \ ", 5000); </SCRIPT> ");
Break;

Default:
Break;