My MS Access database won't update asp.net

Question

I\'m trying to update my database without success. This is how my table looks:

https://i.stack.imgur.com/Q6EDk.png

After opening the modal its look like this:

Answer 1

you just check your update query:
string SqlString = "UPDATE ProductList SET Pname = ?";

change to this:
string SqlString = "UPDATE ProductList SET Pname =@Pname ";

and change command parameter to pass scaler variable:
 cmd.Parameters.AddWithValue("@Pname", prdname.Text);