kendo ui validation depending upon the condition

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ASP.NET

Visual-Studio

hi,
I am using a text box.Depending up on the value entered in the text box,it will add to the panel bar.
1.If i dont enter any value ,it has to validate,I am able to validate this one.
2.If i enter already existing value in the panel bar,Then i have to validate for duplicate values.
For this,I implemented like,In the controller i wrote the query to compare the entered value and returns the count.If the count value is "0" then it is new value and I am adding it to the panel bar using append method.but if the returned value is "1" then That is already existing value and i have to pass the validation message for duplicate value.can u suggest me,how to implement this..