How to get the number of decimal places configured for a site column

Hi,
I have a column 'SampleNumCol' of type Number, the number of decimal places to be displayed is configured as 2.
The column conatins a value, but when retrieved programatically is displayed as 5.00000000 instead of 5.00.
I am retrieving this column using listitem.Properties[field.InternalName].
I need to trim the decimals based on number of decimal places configured for the site column.
How to get the number of decimal places configured for a site column?
Thanks in advance,
dhijit

Get the field as SPFieldNumber and then check DisplayFormat which returns
SPNumberFormatTypes
SPFieldNumber numberField = list.Fields.GetFieldByInternalName("YourNumberFieldName") as SPFieldNumber;
SPNumberFormatTypes numFormatType = numberField.DisplayFormat;

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