Gets or sets a value indicating whether client-side validation is required before the postback event occurs.
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The PostBackOptions.PerformValidation property is used to specify whether client-side validation is required before the postback event can occur. When the value of the PostBackOptions.PerformValidation property is set to true, you can also use the PostBackOptions.ValidationGroup property to specify the name of the validation group for which validation is required before the postback event occurs.