diff --git a/Lab4.RemoveComments/Duomenys.txt b/Lab4.RemoveComments/Duomenys.txt
new file mode 100644
index 0000000..c44a7de
--- /dev/null
+++ b/Lab4.RemoveComments/Duomenys.txt
@@ -0,0 +1,18 @@
+void DuomenysInternet(Grybai & grybai)
+{
+ ifstream fd(u2);
+// string pav, tip;
+// GrybasInfo s1;
+ int ns = 0;
+ bool yra = true;
+ while(!fd.eof() && yra) { // kol yra duomenų ir jie telpa į masyvą
+ fd >> pav >> tip;
+ s1.Dėti (pav, tip);
+ if(!fd.eof() && (ns - 1 < Grybai::CMax ) )
+ grybai[ns++] = s1; // įrašo naują elementą
+ else
+ yra = false;
+ }
+ fd.close();
+ grybai.Dėti(ns);
+}
\ No newline at end of file
diff --git a/Lab4.RemoveComments/InOut.cs b/Lab4.RemoveComments/InOut.cs
new file mode 100644
index 0000000..b0e7236
--- /dev/null
+++ b/Lab4.RemoveComments/InOut.cs
@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+namespace Lab4.RemoveComments
+{
+    class InOut
+    {
+        public static void Process(string fin, string fout, string finfo)
+        {
+            string[] lines = File.ReadAllLines(fin, Encoding.UTF8);
+            string[] cleanedLines = TaskUtils.RemoveComments(lines);
+
+            File.WriteAllLines(fout, cleanedLines);
+
+            using (var writer = File.CreateText(finfo))
+            {
+                // Check line by line which differ
+                int j = 0; // Used for cleaned lines
+                for (int i = 0; i < lines.Length && j < cleanedLines.Length; i++)
+                {
+                    Console.WriteLine("{0} ============ {1}", lines[i], cleanedLines[j]);
+                    if (lines[i] != cleanedLines[j])
+                    {
+                        writer.WriteLine(lines[i]);
+                    }
+                    else
+                    {
+                        j++;
+                    }
+                }
+            }
+
+            /*
+            using (var writerF = File.CreateText(fout))
+            {
+                using (var writerI = File.CreateText(finfo))
+                {
+                    foreach (string line in lines)
+                    {
+                        if (line.Length > 0)
+                        {
+                            string newLine = line;
+                            if (TaskUtils.RemoveComments(line, out newLine))
+                                writerI.WriteLine(line);
+                            if (newLine.Length > 0)
+                                writerF.WriteLine(newLine);
+                        }
+                        else
+                        {
+                            writerF.WriteLine(line);
+                        }
+                    }
+                }
+            }
+            */
+        }
+    }
+}
diff --git a/Lab4.RemoveComments/Lab4.RemoveComments.csproj b/Lab4.RemoveComments/Lab4.RemoveComments.csproj
new file mode 100644
index 0000000..3a26489
--- /dev/null
+++ b/Lab4.RemoveComments/Lab4.RemoveComments.csproj
@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Update="Duomenys.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>
diff --git a/Lab4.RemoveComments/Program.cs b/Lab4.RemoveComments/Program.cs
new file mode 100644
index 0000000..5e8d41e
--- /dev/null
+++ b/Lab4.RemoveComments/Program.cs
@@ -0,0 +1,15 @@
+using System;
+
+namespace Lab4.RemoveComments
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            const string CFd = "Duomenys.txt";
+            const string CFr = "Rezultatai.txt";
+            const string CFa = "Analize.txt";
+            InOut.Process(CFd, CFr, CFa);
+        }
+    }
+}
diff --git a/Lab4.RemoveComments/TaskUtils.cs b/Lab4.RemoveComments/TaskUtils.cs
new file mode 100644
index 0000000..d87b69a
--- /dev/null
+++ b/Lab4.RemoveComments/TaskUtils.cs
@@ -0,0 +1,64 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace Lab4.RemoveComments
+{
+    class TaskUtils
+    {
+        /** Removes comments and returns an indication about performed activity.
+            @param line – line having possible comments
+            @param newLine – line without comments */
+        public static string[] RemoveComments(string[] lines)
+        {
+            List<string> cleanedLines = new List<string>();
+
+            foreach (string line in lines)
+            {
+                Match case1 = Regex.Match(line, @"^(.*)//.*$");
+                if (case1.Success)
+                {
+                    if (case1.Groups[1].Value.Length > 0)
+                    {
+                        cleanedLines.Add(case1.Groups[1].Value);
+                    }
+                }
+                else
+                {
+                    cleanedLines.Add(line);
+                }
+            }
+            
+            /*
+            Match case1 = Regex.Match(line, @"^(.*)//.*$");
+            if (case1.Success)
+            {
+                newLine = case1.Groups[1].Value;
+                return true;
+            }
+            */
+
+            return cleanedLines.ToArray();
+
+            /*
+            Match case2 = Regex.Match(line, @"^$");
+            if (case2.Success)
+            {
+                newLine = case2.Captures[1].Value;
+                return true;
+            }
+            */
+
+       
+            /*newLine = line;
+            for (int i = 0; i < line.Length - 1; i++)
+            if (line[i] == '/' && line[i + 1] == '/')
+            {
+                newLine = line.Remove(i);
+                return true;
+            }
+            return false;*/
+        }
+    }
+}
diff --git a/Lab4.sln b/Lab4.sln
index 50b9c14..ed0ec99 100644
--- a/Lab4.sln
+++ b/Lab4.sln
@@ -5,6 +5,8 @@ VisualStudioVersion = 15.0.28307.1525
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lab4.RemoveLines", "Lab4.RemoveLines\Lab4.RemoveLines.csproj", "{5309D21D-2A14-4332-90EC-504AD89CE397}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Lab4.RemoveComments", "Lab4.RemoveComments\Lab4.RemoveComments.csproj", "{4D9B08C9-5735-4C95-8D2A-BDFC888B1E68}"
+EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lab4.LetterFrequency", "Lab4.LetterFrequency\Lab4.LetterFrequency.csproj", "{F1797B5C-1541-4821-9485-7C3520C5DD8D}"
 EndProject
 Global