How to get the id of the form before saving it?

 
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I'm working on a project where I need to obtain the ID of a form before saving it to the database. This ID is automatically assigned when it's saved in the database, but I need to access it before it's saved. Could someone guide me on how I can achieve this?

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      You can use #form.tablename.id# or

      You can use ID Generator to generate your ID. It increments the value of the variable used in it.
      You can get the variable value using hashvariables which can give you the info on what the next ID is going to be


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