You cannot 'paste' data to SQL.
You can open SSMS and open a table in Edit mode and then insert data but that is not the correct way of doing it.
Data is inserted into a database table using an INSERT command, which requires a DbConnection object & a DbCommand object.
If using MSSQL these are SqlConnection and SqlCommand objects but there is other DbConnection & DbCommand objects for other database types.
MSDN References for SQL objects are below;
SqlConnection Class (System.Data.SqlClient)[
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SqlCommand Class (System.Data.SqlClient)[
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Additional information, including examples, can be accessed below;
Retrieving and Modifying Data in ADO.NET | Microsoft Docs[
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Kind Regards