What does this code snippet do?

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Dear friends,
I have come across this snippet of code while learning ASP.NET.
I am unable to comprehend it.

Please explain in simple words about its objective.

C#

public int ID
{
     get { return (ViewState["ID"] == null) ? 0 : Convert.ToInt32(ViewState["ID"]); }
     set { ViewState["ID"] = value; }
}

Posted 28-May-10 2:19am

touseef4pk

Updated 28-May-10 2:32am

Sandeep Mewara

v3

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3 solutions

Solution 3

ok there is syntax (if Condition true doing 1 if not doing 2) ? (2):(1);
if value of id == null then converting to int32 and return it if not return 0;
in second line we say how set the value of viewstate
if want know some more ,read about property

Posted 28-May-10 10:35am

bany39

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Sandeep Mewara · Accepted Answer · 2010-05-28T02:30:00

touseef4pk wrote:
get { return (ViewState["ID"] == null) ? 0 : Convert.ToInt32(ViewState["ID"]); }

This checks if ID value is stored in Viewstate or not. If it is saved then it is retrieved from Viewstate and sent across. If not stored in a viewstate then ID value returned would be 0.

touseef4pk wrote:
set { ViewState["ID"] = value; }

This sets the ID value tried to be set in a Viewstate. Thus, in future when you try to retrieve the value of ID, it checks the viewstate and send the value stored in it.

touseef4pk wrote:
public int ID

A public property ID is exposed on the page that has both get & set in it. Thus values can be retrieved and set using this ID property exposed.

**PSK_** · Accepted Answer · 2010-05-28T02:44:00

Sandeep has explained everything very nicely.

I believe that you are finding following code more confusing.

return  (ViewState["ID"] == null) ? 0 : Convert.ToInt32(ViewState["ID"]);

In this code ?: operator has been used you can read more about this at following link.

http://msdn.microsoft.com/en-us/library/ty67wk28(VS.80).aspx[^]

Following is the simplified code for the same.

if (ViewState["ID"] == null)
        {
            return 0;
        }
        else
        {
            return Convert.ToInt32(ViewState["ID"]);
        }

What does this code snippet do?

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