How to bind data table column values chart control asp.net

If you display the same values from the datatable as y-axis then it will not be appropriate and users may not be able to visualize the measuring quantity. simply in your case the y-axis can be still the same like 5000, 10000 etc. but the monthly Charge and Payments are plotted in Blue and Mustard colors that makes sense. From your data shown in the bar chart it shows that total Charge (in blue) and the total payment (in mustard), their measuring units are given in the y-axis.

so you are fine.