C# picking unique numbers from an array

I am new to this forum and new to C# programming so please bare with me :-)

I am needing help with writing a section of code that will pick unique numbers from an array. For example, I have an array with 10 numbers from 1-10. how do I get my program to cycle through each of the of the numbers in the array randomly say every 10 sec, but only picking each one once.

Thanks in advance for your help.