C#: Convert String to Double with Non Numerical Values Becoming 0

Using C#, how can I convert a string to a double in such a way as that if the string does NOT contain a double then 0 should be the value?
                    double xyz = Convert.ToDouble("0.123"); // Should be 0.123
                    double xyz = Convert.ToDouble("0"); // Should be 0
                    double xyz = Convert.ToDouble(""); // Should be 0
                    double xyz = Convert.ToDouble("hello world"); // Should be 0

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AndyAinscowFreelance programmer / ConsultantCommented:
Use TryParse instead.  If the TryParse fails then set the value to 0.
where there is an example.

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Fernando SotoRetiredCommented:

Using TryParse as Andy stated, your code modified to show this
double xyz = 999;

Double.TryParse("0.123", out xyz); // Should be 0.123
xyz = 999;
Double.TryParse("0", out xyz); // Should be 0
xyz = 999;
Double.TryParse("", out xyz); // Should be 0
xyz = 999;
Double.TryParse("hello Wrold", out xyz); // Should be 0

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