How to change gridview cell color based on cell item

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VB

I'm a beginner in VB.net and I want to change gridview cell background.

I want to change using different three color, depending on cell data text.

if text of gridview cell is "High", I want to set red color, or

if text of gridveiw cell is "Moderate", I want to set yellow color. or

if text is "Low", I want to set Green color.

I binded gridview with Access datasource.

how I have to code & where I have to place code?

thanks...