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asp.net server control reference

asp.net server control reference

6yAsked Apr 25, 2020, 7:33 PM968.NET

Hi,

I am familiar with this piece of code:

LinkButton myLb = (LinkButton)sender;
string cmd2 = myLb.CommandName;

However I came across this new code to me , but it does the same thing as the upper code.

string cmd = (sender as LinkButton).CommandName;

my question, is this a way of casting. How do I know when to use this kind of conversion.

Thanks

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Jignesh Kumar6y ago
Hi,
Yes, You can cast like new code but sender;s datatype must be a event source. It depeneds where and which way you are using it.
Jin Necesario6y ago
Hi Al,
You can use as when it's valid for a certain object not to be of the type that you want. Then, act based on your needs.

Here are some things you need to remember about as
used to perform a conversion between compatible reference types or nullable types.
returns the object when they are compatible with the given type.
returns null if the conversion is not possible.
Cheers,
Jin