C＃如何改变DataTable中的数据？

I'v got some problem, I use DataTable to store my data in dataGridView. Data was inputed like this:

dt = new DataTable();
dt.Columns.Add("ID", typeof(int));
dt.Columns.Add("par", typeof(string));
dt.Columns.Add("max", typeof(int));
dt.Columns.Add("now", typeof(int));

dt.Rows.Add(new object[] { id++,i + " " + j++, strarr[0], strarr[1] }); // ... etc etc

dataGridView1.DataSource = dt;

now I want to do some changes, I use code:

dt.Rows[1].ItemArray[3] = "VALUE";

When I debug, ItemArray represents the row I want to, so its okey, but still I can't do any changes, whats wrong ? How to update DataTable ??? I'm googling and nothing 

解决方案：

Try the SetField method:

table.Rows[i].SetField(column, value);
table.Rows[i].SetField(columnIndex, value);
table.Rows[i].SetField(columnName, value);

This should get the job done and is a bit "cleaner" than using Rows[i][j].