Validating drop down list
normally web developers put an instruction only item at dropdownlist items top such as an item with text 'select an item' etc.
so web developers need to ensure that users select an item from dropdownlist control other than the first item.
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Then, use that list as the source for the Data Validation drop down list.
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requiredfieldvalidator control's Initial Value property get or set the initial value of the associated input control.
in this example code dropdownlist initial value is 'Choose One', because we set this text for the dropdownlist control's first item Text property value.
In this article I try to explain how to validate Drop Down List and List Box using Required Field Validator.
I hope after reading this article you will be able to use this trick in your code.