OleDbCommand更新数据的一些问题

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using (OleDbConnection connection1 = new OleDbConnection(connectionString))            {                OleDbCommand command1 = new OleDbCommand();                command1.Connection = connection1;                command1.CommandType = CommandType.Text;                command1.CommandText = "select * from 成绩单";                connection1.Open();//打开连接                OleDbDataAdapter myDataAdapter1 = new OleDbDataAdapter(command1);                myDataAdapter1.SelectCommand = command1;                DataSet ds = new DataSet();                myDataAdapter1.Fill(ds,"成绩单");                command1.CommandText = "UPDATE 成绩单 SET ASP=" + finalMarks + " WHERE 学号=" + Application["user"];                OleDbDataAdapter myDataAdapter2 = new OleDbDataAdapter();                myDataAdapter2.UpdateCommand = command1;                command1.ExecuteNonQuery();                 try { }                catch { };                myDataAdapter2.Update(ds,"成绩单");             }

检查字段"ASP" 和 "学号" 的数据类型和等号后面的数据类型是否一致,
例如学号=1
执行sql 语句时会尝试把学号列转成数字型
如果学号中有非数字,则转换出错。

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