diff --git a/Examples/CSharp/CSharp.csproj b/Examples/CSharp/CSharp.csproj
index 1a0fab7..d080093 100644
--- a/Examples/CSharp/CSharp.csproj
+++ b/Examples/CSharp/CSharp.csproj
@@ -145,6 +145,8 @@
     <Compile Include="Text\ReplaceTextOnAllPages.cs" />
     <Compile Include="Text\ReplaceTextOnParticularPage.cs" />
     <Compile Include="RunExamples.cs" />
+    <Compile Include="Text\SetDefaultParagraphStyle.cs" />
+    <Compile Include="Text\SetProofingLanguageForText.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />
diff --git a/Examples/CSharp/RunExamples.cs b/Examples/CSharp/RunExamples.cs
index 22ed24e..3a4540c 100644
--- a/Examples/CSharp/RunExamples.cs
+++ b/Examples/CSharp/RunExamples.cs
@@ -122,6 +122,8 @@ public static void Main()
             //CreateTitleMsStyle.Run();
             //ChangeStyle.Run();
             //ChangePageTitleStyle.Run();
+            SetDefaultParagraphStyle.Run();
+            SetProofingLanguageForText.Run();
 
             //// =====================================================
             #endregion
diff --git a/Examples/CSharp/Text/SetDefaultParagraphStyle.cs b/Examples/CSharp/Text/SetDefaultParagraphStyle.cs
new file mode 100644
index 0000000..e956181
--- /dev/null
+++ b/Examples/CSharp/Text/SetDefaultParagraphStyle.cs
@@ -0,0 +1,74 @@
+// -----------------------------------------------------------------------
+//  <copyright file="SetDefaultParagraphStyle.cs" company="Aspose Pty Ltd">
+//    Copyright (c) 2002-2021 Aspose Pty Ltd. All Rights Reserved.
+//  </copyright>
+// -----------------------------------------------------------------------
+
+namespace Aspose.Note.Examples.CSharp.Text
+{
+    using System;
+    using System.IO;
+
+    class SetDefaultParagraphStyle
+    {
+        public static void Run()
+        {
+            // ExStart:SetDefaultParagraphStyle
+            // ExFor:ParagraphStyle
+            // ExFor:ParagraphStyle.FontName 
+            // ExFor:ParagraphStyle.FontSize
+            // ExFor:RichText
+            // ExFor:RichText.ParagraphStyle
+            // ExFor:RichText.Text
+            // ExFor:TextStyle
+            // ExFor:TextStyle.FontName
+            // ExFor:TextStyle.FontSize
+            // ExSummary:Manipulate by text format using paragraph style.
+
+            var document = new Document();
+            var page = new Page(document);
+            var outline = new Outline(document);
+            var outlineElem = new OutlineElement(document);
+
+            var text = new RichText(document)
+                        {
+                            Text = $"DefaultParagraphFontAndSize{Environment.NewLine}OnlyDefaultParagraphFont{Environment.NewLine}OnlyDefaultParagraphFontSize",
+                            ParagraphStyle = new ParagraphStyle()
+                                                {
+                                                    FontName = "Courier New",
+                                                    FontSize = 20
+                                                }
+                        };
+
+            // Font and font size are from text.ParagraphStyle
+            text.Styles.Add(new TextStyle()
+                                    {
+                                        RunIndex = 27
+                                    });
+
+            // Only font is from text.ParagraphStyle
+            text.Styles.Add(new TextStyle()
+                                    {
+                                        FontSize = 14,
+                                        RunIndex = 53
+                                    });
+
+            // Only font size is from text.ParagraphStyle
+            text.Styles.Add(new TextStyle()
+                                    {
+                                        FontName = "Verdana",
+                                        RunIndex = text.Text.Length
+                                    });
+
+
+            outlineElem.AppendChildLast(text);
+            outline.AppendChildLast(outlineElem);
+            page.AppendChildLast(outline);
+            document.AppendChildLast(page);
+
+            document.Save(Path.Combine(RunExamples.GetDataDir_Text(), "SetDefaultParagraphStyle.one"));
+
+            // ExEnd:SetDefaultParagraphStyle
+        }
+    }
+}
\ No newline at end of file
diff --git a/Examples/CSharp/Text/SetProofingLanguageForText.cs b/Examples/CSharp/Text/SetProofingLanguageForText.cs
new file mode 100644
index 0000000..c88f8bb
--- /dev/null
+++ b/Examples/CSharp/Text/SetProofingLanguageForText.cs
@@ -0,0 +1,58 @@
+// -----------------------------------------------------------------------
+//  <copyright file="SetProofingLanguageForText.cs" company="Aspose Pty Ltd">
+//    Copyright (c) 2002-2021 Aspose Pty Ltd. All Rights Reserved.
+//  </copyright>
+// -----------------------------------------------------------------------
+
+namespace Aspose.Note.Examples.CSharp.Text
+{
+    using System;
+    using System.Globalization;
+    using System.IO;
+
+    class SetProofingLanguageForText
+    {
+        public static void Run()
+        {
+            // ExStart:SetProofingLanguageForText
+            // ExFor:TextStyle
+            // ExFor:TextStyle.Language
+            // ExFor:TextStyle.RunIndex
+            // ExFor:RichText
+            // ExFor:RichText.Styles
+            // ExSummary:Set proofing language for a text.
+
+            var document = new Document();
+            var page = new Page(document);
+            var outline = new Outline(document);
+            var outlineElem = new OutlineElement(document);
+
+            var text = new RichText(document) { Text = "United States Germany China", ParagraphStyle = ParagraphStyle.Default };
+            text.Styles.Add(new TextStyle()
+                                {
+                                    Language = CultureInfo.GetCultureInfo("en-US"),
+                                    RunIndex = 13
+                                });
+            text.Styles.Add(new TextStyle()
+                                {
+                                    Language = CultureInfo.GetCultureInfo("de-DE"),
+                                    RunIndex = 21
+                                });
+            text.Styles.Add(new TextStyle()
+                                {
+                                    Language = CultureInfo.GetCultureInfo("zh-CN"),
+                                    RunIndex = text.Text.Length
+                                });
+
+
+            outlineElem.AppendChildLast(text);
+            outline.AppendChildLast(outlineElem);
+            page.AppendChildLast(outline);
+            document.AppendChildLast(page);
+
+            document.Save(Path.Combine(RunExamples.GetDataDir_Text(), "SetProofingLanguageForText.one"));
+
+            // ExEnd:SetProofingLanguageForText
+        }
+    }
+}
\ No newline at end of file