Why Do My C# MySQL Prepared Statements Fail If I Add Parameters After Preparing?

Prepared Statement Implementation Issues in C# with MySQL

In an attempt to utilize Prepared Statements in C# with MySQL, a user encountered an issue where their code failed to execute correctly. Upon reverting to a conventional statement approach, the program functioned properly.

Examining the user's code snippet, it becomes apparent that the preparation of the statement was attempted before adding parameters. This incorrect order of operations can lead to unexpected results.

To rectify this issue, the following steps must be adhered to:

1. Add parameters to the statement using Parameters.AddWithValue().
2. Prepare the statement using Prepare().

The corrected code should resemble the following:

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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