Why is my C# MySQL Prepared Statement Failing, and How Can I Fix It?

Troubleshooting Prepared Statement in C# with MySQL

You encountered an error while attempting to utilize a prepared statement in your C# program with MySQL. While converting it to a standard statement yielded desired results, you're seeking assistance to identify the issue.

Incorrect Code:

cmd = new MySqlCommand("SELECT * FROM admin WHERE admin_username='@val1' AND admin_password=PASSWORD('@val2')", MySqlConn.conn);
cmd.Prepare();
cmd.Parameters.AddWithValue("@val1", tboxUserName.Text);
cmd.Parameters.AddWithValue("@val2", tboxPassword.Text);

Corrections:

• Use Prepare after Adding Parameters: In the incorrect code, the command was prepared before adding parameters. The correct approach is to first add parameters and then call Prepare().
• Remove Single Quotes from Query: The query contained single quotes surrounding the parameter placeholders (@val1 and @val2), which is incorrect. Prepared statements require parameter placeholders without quotes.

Corrected Code:

cmd = new MySqlCommand("SELECT * FROM admin WHERE admin_username=@val1 AND admin_password=PASSWORD(@val2)", MySqlConn.conn);
cmd.Parameters.AddWithValue("@val1", tboxUserName.Text);
cmd.Parameters.AddWithValue("@val2", tboxPassword.Text);
cmd.Prepare();

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