Sender As Textbox

[maheshwag]

what is the meaning of (textbox)sender yeah! it is casting of it. I have seen in many example but don't know it's meaning and usages.

please guide me in details with example.

thx

am practicing in C# , VS-2005

[MartijnHoekstra]

Sender is by default of type object.
Textbox is derived from Object.
But Textbox contains more methods and properties than object does.
When you 'cast' the 'object sender' to the type 'textbox', while knowing it must be a textbox, you will be able to use all textbox'es methods and properties once more.

So why not put 'textbox sender' in first place?
That is because the event, or handler is not part of textbox, but part of 'object'

[maheshwag]

So the Textbox is not an object?

[maheshwag]

what is an object.?

[maheshwag]

sir, don't feel bad, but it's for my knowledge.