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Some problems using lights in Managed D3D9

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What I have currently is a single quad(a trip-strip) rotating around the y axis, and its location is at the origin. with a point light at (0,0,-10) , and the view at (0,0,-50). The vertex format of the quad is PositionNormalTextured. The problem is that the light only shows up on one side of the quad, and when the quad is perpendicular to the x axis the light flickers between on and off, on the quad until it rotates a few more degrees. This is how I set the vertices:
vertices[0] = new CustomVertex.PositionNormalTextured(-2.0f,2.0f,0.0f,0.0f,0.0f,1.0f,0.0f,1.0f);
vertices[1] = new CustomVertex.PositionNormalTextured(2.0f,2.0f,0.0f,0.0f,0.0f,1.0f,1.0f,1.0f);
vertices[2] = new CustomVertex.PositionNormalTextured(-2.0f,-2.0f,0.0f,0.0f,0.0f,1.0f,0.0f,0.0f);
vertices[3] = new CustomVertex.PositionNormalTextured(2.0f,-2.0f,0.0f,0.0f,0.0f,1.0f,1.0f,0.0f);
and this is how I set up the lighting and material:
System.Drawing.Color color = System.Drawing.Color.White;

D3D.Material material = new D3D.Material();
material.Ambient	= color;
material.Diffuse	= color;
d3dDevice.Material = material;

d3dDevice.Lights[0].Type = LightType.Point;
d3dDevice.Lights[0].Diffuse = System.Drawing.Color.Red;
d3dDevice.Lights[0].Position = new Vector3(1.0f,1.0f,-10.0f);
d3dDevice.Lights[0].Direction = new Vector3(1.0f,1.0f,1.0f);
d3dDevice.Lights[0].Range	= 200.0f;
d3dDevice.Lights[0].Attenuation1 = 0.0001f;
d3dDevice.Lights[0].Enabled = true;

d3dDevice.RenderState.Ambient = System.Drawing.Color.FromArgb(0x202020);
This is using managed DX9 and C# One thing i''m not sure of is the normals that i''m setting for each vertex.

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D3D will only light object with normals faceing a light. In order to light both sides you will have to render 2 quads one with normals pointing one way and one with the normals pointing the other. BTW this is some thing you will have to do in any of the API''s, it''s not managed DirectX Specific.

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