Is it possible to read, write, etc. a specific line in csv whilst not using read all lines?

is it possible to read, write, insert, replace or delete a line whilst not using read all lines?

by now you guys could surmise that the reason why I need to do those stuff because I kinda already have a big pile of text in a csv.

what would practical is maybe to write, insert, replace or delete a text file in a specific Line Number. is that even possible?

here's my code to read, add, and insert text.. but again... they use a read all line method.

Code (csharp):

1.  
2.  
3.         string[] lines = System.IO.File.ReadAllLines(CSVUrl);
4.         string[] temporary;
5.         string allString = "";
6.         int tempInt = 0;
7.         DataIsAlreadyChange = false;
8.         for (int i = 0; i < lines.Length; i++)
9.             {
10.                 LastString = lines[lines.Length-1];                                  
11.                 temporary = lines[i].Split(new char[] { ',' });
12.                 if (temporary[0] == this.gameObject.GetComponent<Slider>().SliderID.ToString())
13.                 {
14.                 // if we enter here, it means that we found a corresponding ID.so what we'll do now is replace the current data but first we check it if its the last data.
15.                      if (i == lines.Length - 1)
16.                         {
17.                     //since this is the last.. all we got to do is replace the Data
18.                             lines[i] = DataString;
19.                             allString += lines[i] + "\n";
20.                             print("hello");
21.                         }
22.                     else
23.                     {
24.  
25.                     //since this is not the last and there are more stuff below the data.  we check how much more is there to put in the all string
26.                             if (DataIsAlreadyChange == false)
27.                             {  
28.                                 ChoosenI = i;    
29.                                 string[] tempLines = new string[lines.Length - i];
30.                                 tempLines[tempInt] = DataString;
31.                                 for (int j = 0; j < lines.Length - i - 1; j++)
32.                                 {
33.                                     tempInt++;      
34.                                     tempLines[tempInt] = lines[i + j + 1];
35.  
36.                                 }
37.                                 tempLast = tempLines;
38.                                 DataIsAlreadyChange = true;
39.                             }
40.                     }
41.                 }
42.                 else
43.                 {
44.                     //if we enter here, it means that we did not find a corresponding ID or there is none. so we'll just copy the line and place it in allString or add a line
45.                        // 7       //8-1=7
46.                     if(i == (lines.Length - 1))
47.                     {
48.                     //this is the very last line and if we got here without any corresponding ID we add a line
49.                             if(DataIsAlreadyChange == true)
50.                             {
51.                                 for(int k = 0; k < lines.Length - ChoosenI;k++)
52.                                 {
53.                                     lines[ChoosenI+k] = tempLast[k];
54.                                    allString += lines[ChoosenI + k] + "\n";
55.                                 }
56.                             }
57.                         else
58.                              Addline();
59.                             AddLineIsActicated = true;
60.  
61.                     }
62.                     else
63.                     {
64.                         //no correspondning ID and not the last line so we want we do is copy it to the allstring.
65.                         //basically this place is where we write the names. like the ID, posX,posY, etc. and the data's that we skip
66.                             if(DataIsAlreadyChange == false)
67.                             {allString += lines[i] + "\n";}
68.                     }
69.                 }
70.             }
71.         if (AddLineIsActicated == false || DataIsAlreadyChange == true)
72.         {
73.             System.IO.File.WriteAllText(CSVUrl, allString);
74.         }
75.  
76.  
77.     void Addline()
78.     {
79.         string[] lines = System.IO.File.ReadAllLines(CSVUrl);
80.         string li = lines[0];
81.         using (StreamWriter sw = File.AppendText(CSVUrl))
82.         {
83.             if (lines[0] != null)
84.             {
85.                 sw.WriteLine(DataString);
86.             }
87.         }
88.     }
89.