C#与数据库交互问题，问题如下

=附近能有什么错误啊，还是说我这个代码错了？

整体代码如下：

//【1】定义连接字符串
string connString = "Server=.;DataBase=MoneyBook;Trusted_Connection=SSPI";
//【2】定义连接对象
SqlConnection con = new SqlConnection(connString);
//【3】打开连接
con.Open();
if(ConnectionState.Open==con.State)
{
Console.WriteLine("连接成功");
}
string sql = "select SAdminName from SAdmin where SAdminId='{0}'"; //固定格式
//【4】组合sql语句
//string Id = "770826899";
string Id;
Id = Console.ReadLine();
sql = string.Format(sql, Id);
//【5】创建SqlCommand对象
SqlCommand cmd = new SqlCommand(sql, con);
//【6】使用单一查询方法
string result = cmd.ExecuteScalar().ToString();
Console.WriteLine(result);
Console.WriteLine("修改信息");
string sql_update = "updata SAdmin set SAdminName='{0}' where SAdminName='{1}'";
string nName;
nName = Console.ReadLine();

        sql_update = string.Format(sql_update, nName,result);
        SqlCommand scmd = new SqlCommand(sql_update, con);
        object re = scmd.ExecuteNonQuery();
        string uresult = cmd.ExecuteScalar().ToString();
        Console.WriteLine(uresult);
        con.Close();
        if (ConnectionState.Closed == con.State)
            Console.WriteLine("断开连接成功");
        Console.ReadLine(); 

string sql_update = "updata SAdmin set SAdminName='{0}' where SAdminName='{1}'";

update 不是 updata