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此代码段引发错误:

更新无法在adapter.Update(ds)上找到TableMapping ['Table']或DataTable'Table'.); 线

为什么会抛出这种错误？

SqlConnection con = new SqlConnection();
con.ConnectionString = connectionString();

DataSet ds = new DataSet();

string strQuery = "SELECT * FROM Cars";
SqlDataAdapter adapter = new SqlDataAdapter();

adapter.SelectCommand = new SqlCommand(strQuery, con);

SqlCommandBuilder builder = new SqlCommandBuilder(adapter);

adapter.Fill(ds, "Cars");

//Code to modify data in the DataSet
ds.Tables["Cars"].Rows[0]["Brand"] = "NewBrand";

adapter.UpdateCommand = builder.GetUpdateCommand();
adapter.Update(ds);