Failed to convert parameter value from a String to Int32

这意味着您将字符串传递给SQL，但是数据库中的字段是Int32.

实际上，这很简单:

This implies that you handing the string to SQL, but the field in the database is an Int32.

In fact, it''s simple:

cm.Parameters["@FilmID"].Value = 34;
cm.Parameters["@FilmName"].Value = "Inception";
cm.Parameters["@FilmID"].Value = "Action/Thriller";

更改最后一行:

Change the last line:

cm.Parameters["@FilmID"].Value = 34;
cm.Parameters["@FilmName"].Value = "Inception";
cm.Parameters["@FilmGenre"].Value = "Action/Thriller";