Using the below steps, you can achieve your result,
3. If you don't mention the return statement then it calls your codebehind function
1. While calling the function it pass the current button control object as a parameter
2. $(CurrentObj).id using this code you can get the id of that button
3. Now, in same row all other control id will be same only the name needs to change. Below, is the example of the control name,
Now, you can just replace the id "btnSave" to "dropdownlist1" you can get the value of the dropdown list control.
Like this, you can get all the fields and you can validate it.
Let me know if you have any questions.
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