DataTable data modification, column change

Add ColumnsDataTable table= New DataTable (); Table.            Columns.Add ("ID", typeof (int)); Table. Columns.Add ("LName", typeof (String));Delete Columntable. Columns.remove ("Name");Modify column namesDt. columns["Num"].  ColumnName = "Search Volume"; Add row DataRow dr = Datatable.newrow (); dr["columnName1"] = value1;dr["columnName2"]= "value2";d r["columnName3"] = "Value3";d ataTable.Rows.Add (DR);

A DataTable is made up of DataRow rows.

Get line Fourth: DataRow dremployee = dtemployees.rows[3];

The DataRow class provides 3 methods for suspending and recovering the state of a data row when editing data: BeginEdit, EndEdit, and CancelEdit methods. When editing data, calling BeginEdit can suspend any event (or exception), use the Items collection to specify the column name and new value of the data to be modified, and re-recover any events (or exceptions) with EndEdit Using CancelEdit, you can roll back any changes and reactivate any event or exception.

Dremployee.beginedit ();  
Dremployee ("empname") = "John";  
Dremployee ("Title") = "Sales";  

Traverse: foreach (DataRow item in DT. Rows)

Verify: if (item["item"] is DBNull | |! Stringutil.hastext (item["tag"]) continue; item["Tag"] is a data in each row.

(DBNull indicates that the database has no related data, stringutil.hastext only when null, "", "" is false

Modifying a sequence

Move column named "Money" to column 5th
datatable.columns["Money"]. SETORDINAL[4];

DataTable data modification, column change