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How to validate dropdownlist in JavaScript
In this article you will see how to put validation in dropdownlist by javascript, suppose first item value of dropdownlist is 0 and text is "-Select-" just like given below and we have to validate that at least one item is selected excluding default i.e "-Select-".

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regex - check if a string contains only alphabets c#
How to validate that input string contains only alphabets, validating that textbox contains only alphabets (letter), so here is some of the ways for doing such task. char have a property named isLetter which is for checking if character is a letter or not, or you can check by the regular expression  or you can validate your textbox through regular expression validator in asp.net. Following code demonstrating the various ways of implementation.

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Uploading large file in chunks in Asp.net Mvc c# from Javascript ajax
Often we have a requirement to upload files in Asp.net, Mvc c# application but when it comes to uploading larger file, we always think how to do it as uploading large file in one go have many challenges like UI responsiveness, If network fluctuate for a moment in between then uploading task get breaks and user have to upload it again etc.

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Regular expression for alphanumeric with space in asp.net c#
How to validate that string contains only alphanumeric value with some spacial character and with whitespace and how to validate that user can only input alphanumeric with given special character or space in a textbox (like name fields or remarks fields). In remarks fields we don't want that user can enter anything, user can only able to enter alphanumeric with white space and some spacial character like -,. etc if you allow. Some of regular expression given below for validating alphanumeric value only, alphanumeric with whitspace only and alphanumeric with whitespace and some special characters.

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