I am working on an ASP.NET project in C# where I am using the ItemBound() method of a DataGrid to get a DataRowView of the current row:

DataRowView drvPortfolio = (DataRowView)e.Item.DataItem;

One of the columns, ExitDateTime, is a SQL Server datetime column that contains some null values. The following code does not work:

DateTime exitDateTime = (DateTime)drvPortfolio["EnterPriceDateTime"];

For the rows with a null value. In that case, I get the following error:

Exception Details: System.InvalidCastException: Specified cast is not valid.

Any ideas?