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am nevoie de ajutor(C#)

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Nu e o eroare legata de C# ci o eroare legata de SQL.

In SQL, intr-un tabel, trebuie sa ai o cheie primara (ID) care presupune doar valori dinstincte. Asadar, nu poti sa ai de 2 ori aceeasi valoare (din textBox1).

De asemenea, e o buna practica sa executi operatii in bloc-uri "try" si sa prinzi exceptiile.


PS: Foloseste "prepared statements", ai SQL Injection acolo.

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