Why RegisterStartupScript and RegisterClientScriptBlock are used?...

> RegisterClientScriptBlock & RegisterStartupScript appends the javascript code from code behind.
> This is because, sometimes we may have to append the javascript code dynamically.
> For example, database value like ProjectID may be required for the execution of the JavaScript.
> Lets consider the main differecne between RegisterClientScriptBlock & RegisterStartupScript.

Difference between RegisterStartupScript and RegisterClientScriptBlock

> RegisterStartupScript will append the javascript code just above the closing form tag.
> The javascript code will get executed only after complete rendering of the View.
> Hence if the javascript is based on any controls, the code will be executed without having any error.
> For example, if the javascript fetches value of any label on View, it will be readly available.
> The following code is used for appending the javascript code by using RegisterStartupScript.



> RegisterClientScriptBlock appends the javascript code just after the starting form tag.
> Here javascript will be executed before the controls get rendered.
> Hence none of the controls will be available for the execution of the javascript.
> If the javascript code fetches any lable value, it will not be available.
> The following code is used for appending the javascript code by using RegisterClientScriptBlock.

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