Try Catch block in asp.net.

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Good Afternoon,
Can anybody please tell this answer. Actually i am trying many time but i didn't getting actual answer and what happens behind this... please give the answer with briefly.
I have two Scenario : 1 & 2...
Scenario:1-

C#

Try{
Response.Redirect("1.aspx");
}

Catch{
Response.Redirect("2.aspx");
}

finally{
Response.Redirect("3.aspx");
}

Scenario:2-

C#

Try
{
Server.Transfer("1.aspx");
}

Catch
{
Server.Transfer("2.aspx");
}

finally
{
Server.Transfer("3.aspx");
}

Posted 11-Mar-14 21:42pm

Pravat_Sahoo

Updated 11-Mar-14 22:09pm

v2

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Abhishek Pant 12-Mar-14 4:07am

I don't know why are you using "Response,redirect" in place of "Response.redirect"

by the way it doesn't/partially handle the redirection in try catch. make it out of try catch it works successfully.

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Pravat_Sahoo · Answer 1 · 2014-03-11T23:06:00

I think this is the appropriate answer..

scenario 1-
The Output of this one is that it will redirect the page to 3.aspx as on try block this will throw a redirect error but after catch block the control will go to the finally block which will redirect the page to 3.aspx

Scenario 2-
In the Second case we are using Server.Transfer which will directly transfer the current page to show the contents of the page to be redirected keeping the url address as the same.. IN this case it will move through all three blocks and would show the contents of 1.aspx, 2.aspx and 3.aspx from the main page... ie., if we are transferring from main.aspx then it will show the contents of 1.aspx plus the content of 2.aspx and the content of 3.aspx in main.aspx

Abhinav S · Answer 2 · 2014-03-11T22:00:00

Solution 3

Its a Response.Redirect and not Response,Redirect.

Posted 11-Mar-14 22:00pm

Abhinav S

AndrewCharlz · Answer 3 · 2014-03-11T21:50:00

What will happen is if there were any page named 1.aspx it will be redirected else
it will result in 404 page not found
in what code uve specified.

but when u try to catch server error then u can try redirecting.

and there is no point in using finally in this screnario.

ill put one best example where we use all these three

C#

 SqlConnection conn2 = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);

public DataTable ExecuteSql(string sql)
       {
           DataTable dt = new DataTable();
           try
           {

               DataSet ds = new DataSet();
               conn2.Open();

               SqlDataReader rdr;
               SqlCommand cmd = new SqlCommand(sql, conn2);
               cmd.CommandTimeout = 60000;
               cmd.CommandType = CommandType.Text;
               rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
               dt.Load(rdr);
               return dt;
           }
           catch(Exception ex)
           {
               throw ex;
           }
           finally
           {
               conn2.Close();

           }
       }

C#

Exception ex = Server.GetLastError();

HttpException httpEx = ex as HttpException;

if (httpEx != null && httpEx.GetHttpCode() == 404)
{
   //do what you want for 404 errors
}

Manikandan K · Answer 4 · 2014-03-11T23:20:00

In both the scenario, 3.aspx will be the final o/p. Because finally block will always be executed whether the exception is thrown or not, it doesn't matter...

For knowing difference between Server.Transfer() and Response.Redirect() methods,
refer the below link,

Difference Between Response.Redirect() and Server.Transfer() Methods in ASP.NET[^]

vsrikanth87 · Answer 5 · 2014-03-13T00:45:00

in Order try and catch finally will be executing so 3.aspx is the output page and coming to Response.Redirect and Server.Transfer

Resposne.redirect: it redirects in the same server itself where as we can get the values of previous page

Server.Transfer: it transfers to the new server where values gets lost of old page

Tom Marvolo Riddle · Answer 6 · 2014-03-11T21:48:00

Solution 1

First Scenario won't Compile

In second one.The page get redirected to 1.aspx page

Both Scenario won't Compile

and i strongly suggest you to read this
Difference Between Response.Redirect() and Server.Transfer() Methods in ASP.NET[^]

Posted 11-Mar-14 21:48pm

Tom Marvolo Riddle

Updated 11-Mar-14 21:58pm

v3

Comments

Tom Marvolo Riddle 12-Mar-14 4:47am

Downvoting for this answer :laugh:.It cause nothing to me

Let me explain:
In both scenario Try should be try
Catch should be catch

C# is case sensitive

Response,redirect ----------- Response.Redirect;

After all ,i/we don't know whether the page exist or not.then how can i/we explain.That's why i posted a link which clearly explains the differences.It's upto you to read or not

Finally,my intention is not to discourage you and i want you to know the unknown.That's it. :)

Pravat_Sahoo 12-Mar-14 5:02am

what you are trying to say i understood nicely. Ok thanks...But you didnot getting my questing thats why you wrote this type of answer.
scenario 1-
The Output of this one is that it will redirect the page to 3.aspx as on try block this will throw a redirect error but after catch block the control will go to the finally block which will redirect the page to 3.aspx..
Scenario 2-
In the Second case we are using Server.Transfer which will directly transfer the current page to show the contents of the page to be redirected keeping the url address as the same.. IN this case it will move through all three blocks and would show the contents of 1.aspx, 2.aspx and 3.aspx from the main page... ie., if we are transferring from main.aspx then it will show the contents of 1.aspx plus the content of 2.aspx and the content of 3.aspx in main.aspx

Tom Marvolo Riddle 12-Mar-14 5:26am

if we are transferring from main.aspx then it will show the contents of 1.aspx plus the content of 2.aspx and the content of 3.aspx in main.aspx----Yup,you're right.

Happy coding :)

Try Catch block in asp.net.

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