Mike,

I believe the UsersDataSet.rb_UsersRow row is declaring the row as your row type for the purpose of the foreach loop. That is where the cast is occurring. If the objects contained in the Rows collection could not be cast to UsersDataSet.rb_UsersRow, an exception would be thrown (probably at compile time).

If you wanted to have to use an explicit cast inside the loop, the loop definition would be:

foreach (DataRow row in ds.Tables[tableName].Rows)
{
    UsersDataSet.rb_UsersRow myRow = (UsersDataSet.rb_UsersRow)row;
    ValidateAddress(myRow);
}

HTH,
Chad

>Hoping someone can help me understand what is happening here. Consider this code:
>

>public override bool CheckRulesHook(DataSet ds, string tableName)
>{
>	foreach (UsersDataSet.rb_UsersRow row in ds.Tables[tableName].Rows)
>	{
>		ValidateAddress(row);
>	}
>}
>

>Passed in to the method is a System.Data.DataSet, however, I can use my typed data row in the foreach without trouble. This seems strange because ds.Tables[tableName].Rows returns a DataRowCollection that is a collection of DataRows, not a collection of my typed rows.
>
>I would think I'd need to cast here, but it's not required. Why is this?
>
>Thanks,
>Mike