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c# - Format decimal value to string with leading spaces

How do I format a decimal value to a string with a single digit after the comma/dot and leading spaces for values less than 100?

For example, a decimal value of 12.3456 should be output as " 12.3" with single leading space. 10.011 would be " 10.0". 123.123 is "123.1"

I'm looking for a solution, that works with standard/custom string formatting, i.e.

decimal value = 12.345456;
Console.Write("{0:magic}", value); // 'magic' would be a fancy pattern.
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This pattern {0,5:###.0} should work:

string.Format("{0,5:###.0}", 12.3456) //Output  " 12.3"
string.Format("{0,5:###.0}", 10.011)  //Output  " 10.0" 
string.Format("{0,5:###.0}", 123.123) //Output  "123.1"
string.Format("{0,5:###.0}", 1.123)   //Output  "  1.1"
string.Format("{0,5:###.0}", 1234.123)//Output "1234.1"

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