This property gets or sets the formatting structure of the data displayed on a column
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You can set the display format at your will.
Each argument can be reached as {<n>}. Where n is the number of the argument. It's normal to set n to 0 (first argument). This is because a column has only one argument and 0 is the first and the only one.
The format of the argument comes when you add :Xnn to the n number, in the form {0:F2}. This will try to show the argument as a fixed point number with two decimal places.
The meaning of each formatting parameter shows here:
Column Description C Currency format D Decimal format E Exponential format F Fixed format G General format N Numeric format X Hexadecimal format G General format DataFormatString=<a href={0}>link<a> Will display the string as a link
Namespace: System.Web.UI.WebControls
Assembly: System.Web (in System.Web.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0