Specified cast is not valid.. how to resolve this

Question

I have the below function ``` public object Convert(object value) { string retVal = string.Empty; int oneMillion = 1000000; retVal = ((double)value / oneMillion).ToString("###,###,###.###"); return retVal; } ``` I am invoking like ``` var result = Convert(107284403940); ``` Error: "Specified cast is not valid." how to fix... Note:~ the object value can be double, decimal, float, integer(32 and 64)..anything Is it possible to do the typecasting at runtime?

Accepted Answer

Use `Convert.ToDouble(value)` rather than `(double)value`. It takes an `object` and supports all of the types you asked for! :)

Also, your method is always returning a `string` in the code above; I'd recommend having the method indicate so, and give it a more obvious name (`public string FormatLargeNumber(object value)`)

Specified cast is not valid.. how to resolve this

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