diff --git a/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values.sln b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values.sln
new file mode 100644
index 000000000..ad34e0c0a
--- /dev/null
+++ b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31911.196
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Sum-mergefield-values", "Sum-mergefield-values\Sum-mergefield-values.csproj", "{D3AF529E-DB54-4294-A876-DD42E1E472D0}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{D3AF529E-DB54-4294-A876-DD42E1E472D0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D3AF529E-DB54-4294-A876-DD42E1E472D0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D3AF529E-DB54-4294-A876-DD42E1E472D0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D3AF529E-DB54-4294-A876-DD42E1E472D0}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {58137FF9-5AE1-4514-9929-3A8A7DA1DFEB}
+	EndGlobalSection
+EndGlobal
diff --git a/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Data/ReportData.json b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Data/ReportData.json
new file mode 100644
index 000000000..6d8b62272
--- /dev/null
+++ b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Data/ReportData.json
@@ -0,0 +1,18 @@
+{
+  "Toplevel1":"1",
+  "Reports": 
+  [
+    {
+      "Subject": "Maths",
+      "Marks": "80"
+    },
+	{
+      "Subject":"English",
+      "Marks":"70"
+    },
+	{
+      "Subject":"Science",
+      "Marks":"82"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Data/Template.docx b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Data/Template.docx
new file mode 100644
index 000000000..8b395a468
Binary files /dev/null and b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Data/Template.docx differ
diff --git a/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Output/.gitkeep b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Output/.gitkeep
new file mode 100644
index 000000000..5f282702b
--- /dev/null
+++ b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Output/.gitkeep
@@ -0,0 +1 @@
+
\ No newline at end of file
diff --git a/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Program.cs b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Program.cs
new file mode 100644
index 000000000..8fbb34b52
--- /dev/null
+++ b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Program.cs
@@ -0,0 +1,103 @@
+using Newtonsoft.Json.Linq;
+using Syncfusion.DocIO;
+using Syncfusion.DocIO.DLS;
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace Sum_mergefield_values
+{
+     class Program
+    {
+        static int totalMarks = 0;
+        static void Main(string[] args)
+        {
+            using (FileStream fileStream = new FileStream(Path.GetFullPath(@"Data/Template.docx"), FileMode.Open))
+            {
+                //Loads an existing Word document.
+                using (WordDocument wordDocument = new WordDocument(fileStream, FormatType.Automatic))
+                {
+                    // Gets JSON object from JSON string.
+                    JObject jsonObject = JObject.Parse(File.ReadAllText(Path.GetFullPath(@"Data/ReportData.json")));
+                    // Converts to IDictionary data from JSON object.
+                    IDictionary<string, object> data = GetData(jsonObject);
+
+                    //Creates the mail merge data table in order to perform mail merge
+                    MailMergeDataTable dataTable = new MailMergeDataTable("Reports", (List<object>)data["Reports"]);
+
+                    //Uses the mail merge event handler to sum the field's values and set that value to the TotalMarks field during mail merge.
+                    wordDocument.MailMerge.MergeField += new MergeFieldEventHandler(MergeField_Event);
+
+                    //Performs the mail merge operation with the dynamic collection
+                    wordDocument.MailMerge.ExecuteGroup(dataTable);
+
+                    string[] fieldNames = new string[] { "TotalMarks" };
+                    string[] fieldValues = new string[] { "" };
+
+                    //Performs the mail merge
+                    wordDocument.MailMerge.Execute(fieldNames, fieldValues);
+
+                    //Saves the WOrd document file to file system.    
+                    using (FileStream outputStream = new FileStream(Path.GetFullPath(@"Output/Result.docx"), FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite))
+                    {
+                        wordDocument.Save(outputStream, FormatType.Docx);
+                    }
+                }
+            }
+        }
+        /// <summary>
+        /// Event to sum the field's values and set that value to the TotalMarks field during mail merge.
+        /// </summary>
+        private static void MergeField_Event(object sender, MergeFieldEventArgs args)
+        {
+            
+            if (args.FieldName == "Marks")
+            {
+                //sum the Marks field values.
+                totalMarks += Convert.ToInt32(args.FieldValue);
+            }
+            if (args.FieldName == "TotalMarks")
+            {
+                //Set sum of the Marks field values to the TotalMarks field;
+                args.Text = totalMarks.ToString();
+            }
+        }
+
+        /// <summary>
+        /// Gets array of items from JSON array.
+        /// </summary>
+        /// <param name="jArray">JSON array.</param>
+        /// <returns>List of objects.</returns>
+        private static List<object> GetData(JArray jArray)
+        {
+            List<object> jArrayItems = new List<object>();
+            foreach (var item in jArray)
+            {
+                object keyValue = null;
+                if (item is JObject)
+                    keyValue = GetData((JObject)item);
+                jArrayItems.Add(keyValue);
+            }
+            return jArrayItems;
+        }
+        /// <summary>
+        /// Gets data from JSON object.
+        /// </summary>
+        /// <param name="jsonObject">JSON object.</param>
+        /// <returns>IDictionary data.</returns>
+        private static IDictionary<string, object> GetData(JObject jsonObject)
+        {
+            Dictionary<string, object> dictionary = new Dictionary<string, object>();
+            foreach (var item in jsonObject)
+            {
+                object keyValue = null;
+                if (item.Value is JArray)
+                    keyValue = GetData((JArray)item.Value);
+                else if (item.Value is JToken)
+                    keyValue = ((JToken)item.Value).ToObject<string>();
+                dictionary.Add(item.Key, keyValue);
+            }
+            return dictionary;
+        }
+    }
+}
diff --git a/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Sum-mergefield-values.csproj b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Sum-mergefield-values.csproj
new file mode 100644
index 000000000..f76ffb925
--- /dev/null
+++ b/Mail-Merge/Sum-mergefield-values/.NET/Sum-mergefield-values/Sum-mergefield-values.csproj
@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Sum_mergefield_values</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="Syncfusion.DocIO.Net.Core" Version="*" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="Data\ReportData.json">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Data\Template.docx">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Output\.gitkeep">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>