diff --git a/DicomGrepCli/Program.cs b/DicomGrepCli/Program.cs
index 2749480..ebf47c6 100644
--- a/DicomGrepCli/Program.cs
+++ b/DicomGrepCli/Program.cs
@@ -1,4 +1,5 @@
-using DicomGrepCore.Enums;
+using DicomGrepCore.Entities;
+using DicomGrepCore.Enums;
 using DicomGrepCore.Services;
 using FellowOakDicom;
 using System.CommandLine;
@@ -103,20 +104,34 @@ static async Task<int> Main(string[] args)
 
 
             rootCommand.SetHandler(
-                (lookupOptionValue, folderOptionValue, recursiveOptionValue, ignoreCaseOptionValue, tagOptionValue, valueOptionValue) =>
-                {
-                    if (lookupOptionValue.HasValue)
-                    {
-                        PrintLookup(lookupOptionValue.Value);
-                    }
-                },
-                lookupOption, folderOption, recursiveOption, caseSensitiveOption, tagOption, valueOption
+                DoRootCommand,
+                lookupOption, new SearchCriteriaBinder(folderOption, fileTypeOption, recursiveOption, sopClassOption, tagOption, valueOption, caseSensitiveOption, wholdWordOption, threadsOption, patternOption)
                 );
 
 
             return await rootCommand.InvokeAsync(args);
         }
 
+        private static void DoRootCommand(LookupType? lookupOptionValue, SearchCriteria criteria)
+        {
+            if (lookupOptionValue.HasValue)
+            {
+                PrintLookup(lookupOptionValue.Value);
+            }
+            else
+            {
+                if (string.IsNullOrEmpty(criteria.SearchPath))
+                {
+                    Console.WriteLine("Please specify the directory.");
+                    return;
+                }
+
+                var tokenSource = new CancellationTokenSource();//dummy
+                SearchService searchService = new SearchService();
+                searchService.Search(criteria, tokenSource);
+            }
+        }
+
         private static void PrintLookup(LookupType lookupType)
         {
             DictionaryService dictionaryService = new DictionaryService();
diff --git a/DicomGrepCli/SearchCriteriaBinder.cs b/DicomGrepCli/SearchCriteriaBinder.cs
new file mode 100644
index 0000000..2fe06fe
--- /dev/null
+++ b/DicomGrepCli/SearchCriteriaBinder.cs
@@ -0,0 +1,62 @@
+using DicomGrepCore.Entities;
+using DicomGrepCore.Enums;
+using System;
+using System.Collections.Generic;
+using System.CommandLine;
+using System.CommandLine.Binding;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DicomGrepCli
+{
+    internal class SearchCriteriaBinder : BinderBase<SearchCriteria>
+    {
+
+        private readonly Option<string> _folderOption;
+        private readonly Option<string> _fileTypeOption;
+        private readonly Option<bool> _recursiveOption;
+        private readonly Option<string> _sopClassOption;
+        private readonly Option<string> _tagOption;
+        private readonly Option<string> _valueOption;
+        private readonly Option<bool> _caseSensitiveOption;
+        private readonly Option<bool> _wholeWordOption;
+        private readonly Option<int> _threadsOption;
+        private readonly Option<MatchPatternEnum> _patternOption;
+
+
+        public SearchCriteriaBinder(Option<string> folderOption, Option<string> fileTypeOption,
+            Option<bool> recursiveOption, Option<string> sopClassOption, Option<string> tagOption,
+            Option<string> valueOption, Option<bool> caseSensitiveOption, Option<bool> wholeWordOption,
+            Option<int> threadsOption, Option<MatchPatternEnum> patternOption)
+        {
+            _folderOption = folderOption;
+            _fileTypeOption = fileTypeOption;
+            _recursiveOption = recursiveOption;
+            _sopClassOption = sopClassOption;
+            _tagOption = tagOption;
+            _valueOption = valueOption;
+            _caseSensitiveOption = caseSensitiveOption;
+            _wholeWordOption = wholeWordOption;
+            _threadsOption = threadsOption;
+            _patternOption = patternOption;
+        }
+
+        protected override SearchCriteria GetBoundValue(BindingContext bindingContext)
+        {
+            return new SearchCriteria
+            {
+                SearchPath = bindingContext.ParseResult.GetValueForOption(_folderOption),
+                FileTypes = bindingContext.ParseResult.GetValueForOption(_fileTypeOption),
+                IncludeSubfolders = bindingContext.ParseResult.GetValueForOption(_recursiveOption),
+                SearchSopClassUid = bindingContext.ParseResult.GetValueForOption(_sopClassOption),
+                SearchTag = bindingContext.ParseResult.GetValueForOption(_tagOption),
+                SearchText = bindingContext.ParseResult.GetValueForOption(_valueOption),
+                CaseSensitive = bindingContext.ParseResult.GetValueForOption(_caseSensitiveOption),
+                WholeWord = bindingContext.ParseResult.GetValueForOption(_wholeWordOption),
+                SearchThreads = bindingContext.ParseResult.GetValueForOption(_threadsOption),
+                MatchPattern = bindingContext.ParseResult.GetValueForOption(_patternOption)
+            };
+        }
+    }
+}