exception handling

Hi Anjali,

A try block is used by C# programmers to partition code that might be affected by an exception.

Associated catch blocks are used to handle any resulting exceptions.

A finally block contains code that is run regardless of whether or not an exception is thrown in the try block,

such as releasing resources that are allocated in the try block. A try block requires one or more associated catch blocks,

or a finally block, or both.

The following examples show a try-catch statement, a try-finally statement, and a try-catch-finally statement.

try

{

// Code to try goes here.

}

catch (SomeSpecificException ex)

{

// Code to handle the exception goes here.

// Only catch exceptions that you know how to handle.

// Never catch base class System.Exception without

// rethrowing it at the end of the catch block.

}

-------------------------------------

try

{

// Code to try goes here.

}

finally

{

// Code to execute after the try block goes here.

}

--------------------------------------

try

{

// Code to try goes here.

}

catch (SomeSpecificException ex)

{

// Code to handle the exception goes here.

}

finally

{

// Code to execute after the try (and possibly catch) blocks

// goes here.

}

Realtime Example:

If you declareing connectionstring like

Data Source=test;Initial Catalog=TestDemo;User Id=sa;Password=;

Here defining the sqlconnection like

SqlConnection con = new SqlConnection("Data Source=teset;Initial Catalog=TestDemo;User Id=sa;Password=;");

now checking connection open or not

con.open();

here checking connection is correc or not

If it is wrong through the exception like permision password not valide curent user

If it is corret connection will be open.

thats why declare like

try

{

// some code

}

catch

{

//Here if exception what you need display in front end users

}

2 Replies

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Vignesh Mani11y ago
Hi
It handle the error in our code. If you use exception handling when occur error it do not show error Page. It display user defined message or any default message.

We write code insight try block.

try
{

}
Exception()
{

}
Raja T11y ago
Hi Anjali,

A try block is used by C# programmers to partition code that might be affected by an exception.
Associated catch blocks are used to handle any resulting exceptions.
A finally block contains code that is run regardless of whether or not an exception is thrown in the try block,
such as releasing resources that are allocated in the try block. A try block requires one or more associated catch blocks,
or a finally block, or both.
The following examples show a try-catch statement, a try-finally statement, and a try-catch-finally statement.
try
{
// Code to try goes here.
}
catch (SomeSpecificException ex)
{
// Code to handle the exception goes here.
// Only catch exceptions that you know how to handle.
// Never catch base class System.Exception without
// rethrowing it at the end of the catch block.
}
-------------------------------------
try
{
// Code to try goes here.
}
finally
{
// Code to execute after the try block goes here.
}
--------------------------------------
try
{
// Code to try goes here.
}
catch (SomeSpecificException ex)
{
// Code to handle the exception goes here.
}
finally
{
// Code to execute after the try (and possibly catch) blocks
// goes here.
}

Realtime Example:

If you declareing connectionstring like

Data Source=test;Initial Catalog=TestDemo;User Id=sa;Password=;

Here defining the sqlconnection like

SqlConnection con = new SqlConnection("Data Source=teset;Initial Catalog=TestDemo;User Id=sa;Password=;");

now checking connection open or not
con.open();
here checking connection is correc or not
If it is wrong through the exception like permision password not valide curent user
If it is corret connection will be open.

thats why declare like

try
{
// some code
}
catch
{
//Here if exception what you need display in front end users
}