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Sivasankar K 1Sivasankar K 1 

With help of ISBLANK() I can check text field and number filed are blank or not. If I am used ISNULL() to check both number filed and text field is blank or not.Then it does not check the blank.so please clarify my doubt. and also give Ex :to ISNULL()

sumithasumitha
Text fields are never null, so using ISNULL() with a text field always returns false. For example, the formula field IF(ISNULL(new__c) 1, 0) is always zero regardless of the value in the New field. For text fields, use the ISBLANK function instead.
Hope it help,

Regards,
Sumitha
Sivasankar K 1Sivasankar K 1
thanks to clarify my doubt.