Help convert Javascript To C#

I'm currently in the process of converting this javascript to C# (This is only part of code, hence Random.Range 1,22) but I keep getting the error "error CS0119: Expression denotes a `type', where a `variable', `value' or `method group' was expected" What exactly is wrong about this code? I'm not exactly good at converting yet, So please be kind. The error occurs at the if statement

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Spawn20 : MonoBehaviour {
5.  
6.     public GameObject cube;
7.     public GameObject warning;
8.     public int spawn_position;
9.         public static int num;
10.  
11. void Update () {
12.             num = Random.Range(1,22);
13.      
14.         //1
15.         if (num ==1) {
16.             spawn_position = Vector3(-9.78,0,0);
17.             int temp_spawn_cube = Instantiate(cube, spawn_position, Quaternion.identity);
18.          
19.         }

 

You need to add the 'new' keyword to your Vector3 constructor

Code (CSharp):

1. spawn_position =  new Vector3(-9.78,0,0);

 

As well as above post.

Should be

Code (CSharp):

1. Vector3 spawn_position;

Doesn't need to be static.

Should be

Code (CSharp):

1. GameObject temp_spawn_cube = [URL='http://unity3d.com/support/documentation/ScriptReference/30_search.html?q=Instantiate']Instantiate[/URL](cube, spawn_position, [URL='http://unity3d.com/support/documentation/ScriptReference/30_search.html?q=Quaternion']Quaternion[/URL].[URL='http://unity3d.com/support/documentation/ScriptReference/30_search.html?q=identity']identity[/URL]);

 

Lol my eyes caught one issue and my brain just stopped there