就像KM所说的，
改为执行 此操作 ：
private static void UpdateQuestionByID(
int questionID, string question, string answer, string lastEdited)
{
using (var conn = new sqlConnection(connectionString))
{
conn.open();
const string QUERY =
@"UPDATE Questions " +
@"SET Question = @Question, Answer = @Answer, LastEdit = @LastEdited " +
@"WHERE ID = @QuestionID";
using (var cmd = new sqlCommand(QUERY, conn))
{
cmd.Parameters.AddWithValue("@Question", question);
cmd.Parameters.AddWithValue("@Answer", answer);
cmd.Parameters.AddWithValue("@LastEdited", lastEdited);
cmd.Parameters.AddWithValue("@QuestionID", questionID);
cmd.ExecuteNonQuery();
}
}
}
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