>This is a newbie question. In my project I have a dataset file (MyDataSet.xsd, MyDataSet.Designer.cs, MyDataSet.cs). I need to add a couple of columns to this dataset. I double click on MyDataSet.xsd file in the VS Solution Explorer. I see the MYDATASET image with all the columns. I can right-mouse click and add a column. But how do I specify the type of the new column? In fact, I can't even figure out how to see the type of any of the existing columns.
>TIA.

I've never used the GUI method to alter the .xsd file.
I wrote a program that creates the datatables , adds them to the dataset ds and then uses

ds.WriteXmlSchema(filename);

to create the .xsd.