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Vinay TemburnikarVinay Temburnikar 

Which API is the best to use in my case? BULK or REST?

I have to upload csv files to Salesforce Sandbox. The records in the csv files range from 4,000 to 10,000 with one file containing 170,000 records. 

Given that my largest file has around 170,000 records, is BULK API my safest bet? Also, would love if I can get any resources to create a .NET application to run the API. 

Thank you.