Use expression in winform chart y Series

[Ravi Kumar12233]

In my winform app ,

1. i want to use chart from toolbox (instead of making on using RDLC report).
2. Using two columns of my access database source (Size_in_mg , And count of "ID column")
3. But in Y axis i want to use expression like =Count((Fields!Number.Value)) but the chart won't allow me to as it simply takes names of he column.
4. i have tried searching in web but didn't find convincing result. So please share any link or share your knowledge so that i can learn

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