SQL command INSERT is working but the data not appear in table

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If your c# code executes without any exceptions, it updates the database too. You have probably used AttachDbFilename=|DataDirectory|\yourDB.mdf in your ConnectionString, that means the databse that is updated is located in the subfolder BIN\DEBUG folder of your project. If you want to see the updated data just attach the database located in the bin/debug folder in ssms.
for more details read this post.
Also make sure your table in server explorer is not already open, if it is already open you must refresh it to show updated data. Please note:as mentioned in the comments you should always use parameterized queries to avoid Sql Injection.

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