VS 2008 Add Datarow With Unique Identifier?

I have a table in an SQL database bound to a datagridview and am having an issue with understanding what happens when I add a new data row.

My datatable is built in code with the first column created using this sql command...

vb

cmdString = String.Format("CREATE TABLE {0} ({1} INT IDENTITY(1,1) NOT NULL, ", tableName, columnNames(0))

after that there a a number of other columns added to the command to build the table. After the table is created, I fill the datatable and bind the datagridview using this code....

vb
Dim cmdString As String = String.Format("SELECT * FROM {0}", DB_DATALOG_TABLE_NAME)
DataLogAdapter = New SqlDataAdapter(cmdString, dBConnection)
DataLogTable = New DataTable

[Code].....

This is where my understanding is falling. Because I have created the datatable's first column with the NOT NULL key word, an exception throws when I try to update the data adapter because the first column of the data row is empty By creating the table with the first column the IDENTITY key word, doesn't that imply that the database will generate the value for that column? If so, when I add a new datarow, how does the identity column get filled?