IndexBuffer Class
XNA Game Studio 2.0
Describes the rendering order of the vertices in a vertex buffer.
Namespace: Microsoft.Xna.Framework.Graphics
Assembly: Microsoft.Xna.Framework (in microsoft.xna.framework.dll)
The vertex stream and index data of the graphics device must be set before any call to DrawIndexedPrimitives. The following example sets the index data and associates a user-created vertex buffer of type VertexPositionNormalTexture with vertex stream 0 (zero) of the graphics device.
graphics.GraphicsDevice.Vertices[0].SetSource(
vertexBuffer, 0,
VertexPositionNormalTexture.SizeInBytes);
graphics.GraphicsDevice.Indices = lineListIndexBuffer;