ImportRow doesn't import the data...

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Hi,

I am using ImportRow to get selected rows from a DataTable and add them to a
new table. The code looks something like this:

DataTable dtTemp = new DataTable();

foreach(DataRow drOld in dsOld.Tables["Customers"].Rows)
{
foreach(DataRow drExisting in DTNewCustomers.Rows)
{
if(Convert.ToInt32(drOld["HouseNo"]) == Convert.ToInt32
( drExisting[0]))
{
dtTemp.ImportRow(drOld);
}
}
}

dsCustomers.Tables.Add(dtTemp);

When I step through it, drOld has 7 values and this row is added to dtTemp
(I have a breakpoint on the line:

dtTemp.ImportRow(drOld);

and the row count of dtTemp increments by 1).

However, the data is not being copied across. I simply get an empty
Datagrid when binding to the dtTemp table, and the ItemArray property of each
row in dtTemp has a count of 0.

Does anyone know why this would be?