DataTable dt = new DataTable();

        DataRow dr = null;

        dt.Columns.Add(new DataColumn("Unit", typeof(string)));

        for (int i = 0; i < 10; i++)

        {

          dr = dt.NewRow();

          dr["Unit"] = "";

          dt.Rows.Add(dr);

        }

Adding Data to a Table 

The following example demonstrates how to create a new row by calling the NewRow method.

Dim workRow As DataRow = workTable.NewRow()

You then can manipulate the newly added row using an index or the column name, as shown in the following example.

workRow("CustLName") = "Smith"
workRow(1) = "Smith"

After data is inserted into the new row, the Add method is used to add the row to thehttp://msdn.microsoft.com/en-us/library/system.data.datarowcollection(v=vs.80).aspx, shown in the following code.

workTable.Rows.Add(workRow)

You can also call the Add method to add a new row by passing in an array of values, typed as http://msdn.microsoft.com/en-us/library/system.object(v=vs.80).aspx, as shown in the following example.

workTable.Rows.Add(new Object() {1, "Smith"})

Passing an array of values, typed as Object, to the Add method creates a new row inside the table and sets its column values to the values in the object array. Note that values in the array are matched sequentially to the columns, based on the order in which they appear in the table.

The following example adds 10 rows to the newly created Customers table.

Dim workRow As DataRow
Dim i As Integer

For i = 0 To 9
  workRow = workTable.NewRow()
  workRow(0) = i
  workRow(1) = "CustName" & I.ToString()
  workTable.Rows.Add(workRow)
Next

DataRow dr = null;

          dr = dt.NewRow();

          dr[dt.Columns[0].ToString()] = "5";
  dr[dt.Columns[1].ToString()] = "5";

          dt.Rows.Add(dr);

Hope this helpful