How to Prevent Duplicate Entries in SQL INSERT Statements?

How to Prevent Duplicate Entries Using "INSERT WHERE NOT EXISTS"

Problem:

asp.net data entry requires ensuring unique insertions into a table with columns SoftwareName and SoftwareType. If an insert query contains duplicate information, an error should be thrown and data should not be inserted.

Solution 1: Using IF Statement

IF NOT EXISTS 
    (   SELECT  1

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