Unity 3D C# - Drawing Lines On Tiles

I'm close to getting this working, it works like 30% of the time but I want 100%, basically I just want to draw a line to one point to another, in 2D array of any size, I use 50,50 for testing, this is my code, wondering if anyone can help me fix this problem?

 //still neeeds to be fixed
     void DrawLineOnArray(int pointAx, int pointAz, int pointBx, int pointBz){
 
 //        int width = pointBx - pointAx;
 //        int length = pointBz - pointAz;
 
         int width = 50;
         int length = 50;
 
     
 
         int[,] lineBlocks = new int[width, length];
     
         //set the whole array to 0
         for(int z = 0; z < length; z++){
             for(int x = 0; x < width; x++){
                 lineBlocks[x, z] = 0;
             }
         }
 
 
         int slope = (pointBz - pointAz) / (pointBx - pointAx);
 
         //set the line to the array
         for(int z = 0; z < length; z++){
             for(int x = 0; x < width; x++){
                 //if((z == pointAz + length * (x - pointAx) / width) || (x == pointAx + length * (z - pointAz) / width)){
                     
                 if( (z == slope * (x - pointAx) + pointAz) || (x == slope * (z - pointAz) + pointAx) ){
                     lineBlocks[x, z] = 2;
                 }
                 //}
             }
         }
 
         //replace the all blocks witht he line in the lineblocks array
         for(int z = 0; z < length; z++){
             for(int x = 0; x < width; x++){
                 //ignore 0's allowing for over laping circles
                 if(lineBlocks[x, z] != 0){
                     allBlocks[x, z] = lineBlocks[x, z];
                 }
             }
         }
 
     }