How to make the Gap width to zero between the columns of stackcolumn series chart in .NET 2010 Chart Control

Question

I have two series of stack column chart types, i want to make the gap between the columns to zero in .net chart control, this is easy in excel making the gap width to zero

but in .Net chart control is there any possibility

2. out of two series one make one series column colour to none

3. then change the order of two series then ill get the waterfall chart which i want

 

please chek the images, i want my chart like image 2 with no gaps

please help in above 3 points

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Lakshmi Dudala