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2D perpendicular vector

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Hello. I am writing a generic Matrix / Vector library for the C# language. I am not especially great at math and that is partly why I am doing this as an exercise. One of the methods I would like is to calculate the 2D perpendicular vector to another. I wrote the following code which seems to do that just fine.
        public Vector3D getPrependicular()
            float mx = this.Y / this.X;
            mx = -1 / mx;

            float y = (this.X * mx);

            return new Vector3D(this.X, y, 1);
However when I draw the perpendicular vector, although the angle is 90 degrees, its distance is scaled drastically. I would like the length of the perendicular vector to be that of the original vector. How would I go about doing that? Thanks in advance!

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