error handling in c#.net

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hi all...,
Plz help me,
i am passing null value in int datatype then error is occured following is my code:

C#

int FID = convert.Toint32(linkbutton.CommandArgument);

some records FID have values but some records FID have NULL. when it have null value the error occured "Input string was not in correct format" i want to handle this error.

Thanks in advance.....

Posted 13-May-12 23:14pm

dA.d

Updated 13-May-12 23:21pm

Rahul Rajat Singh

v2

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4 solutions

Solution 5

Hi,
Try this:

C#

if(linkbutton.CommandArgument != null){
    int FID = convert.Toint32(linkbutton.CommandArgument);
}
else{
   int FID = 0; //Compare your data with 0 if it is required.
}

All the best.

Posted 13-May-12 23:52pm

AmitKumar89

Solution 3

Hi,

Try like this:

C#

if ((txtValue.Text).Trim() == "")
{
     cmd.Parameters("@FID").Value = DBNull.Value
}
else
{
    Pass the actual value;

}

Posted 13-May-12 23:43pm

dharan1990

Updated 14-May-12 0:28am

v2

Comments

dA.d 14-May-12 5:48am

Thanks for replay......
but i want to handle error using try and catch blocks,
and that FID value i want to pass in delete stored procedure as parameter value.

Solution 4

Or simply :

C#

int FID = 0;
try
{
 FID = convert.Toint32(linkbutton.CommandArgument);
 //here the FID is a valid value so go ahead and do soemthing
}
catch(Exception ex)
{
  FID = 0;
}

Posted 13-May-12 23:46pm

Ashish Sehajpal

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Rahul Rajat Singh · Accepted Answer · 2012-05-13T23:37:00

Solution 2

Here is the try catch version of it with Pokemon Exception handing

C#

try
{
 int FID = convert.Toint32(linkbutton.CommandArgument);
 //here the FID is a valid value so go ahead and do soemthing
}
catch(Exception ex)
{
  //darn it, invalid value found. lets think about handling it or ignoring it
}

also If you prefer not to handle an exception if the conversion fails, you can call the Int32.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.

Posted 13-May-12 23:37pm

Rahul Rajat Singh

Updated 13-May-12 23:38pm

v2

Comments

dA.d 14-May-12 5:45am

thanks again......
i want to pass FID value in delete stored procedure for that how can get FID in procedure.
i use like
DeleteStoreProcedureName(FID);
but compilation error is FID not exist.

Rahul Rajat Singh 14-May-12 5:48am

Perhpas you are calling it outsice the try block and after catch block. i recommend moving it inside the try block or change the try block to this one

int FID = 0;
try
{
FID = convert.Toint32(linkbutton.CommandArgument);
//here the FID is a valid value so go ahead and do soemthing
}

dA.d 14-May-12 5:57am

thanks for helping me...

Rahul Rajat Singh 14-May-12 6:02am

You are most welcome

VJ Reddy 15-May-12 4:35am

My 5!