New-path-with-data.cs

var pathBinding = new Binding()
{
    Source = "M 12.5,3.5 a 22.5,22.5 0 0,1 0,43 a 22.5,22.5 0 1,0 0,-43 z"
};
var newPath = new Path
{
    Height = height,
    Width = width,
    Stretch = Stretch.Uniform
};
BindingOperations.SetBinding(newPath, Path.DataProperty, pathBinding);
return newPath;