added the sample

Author: irfanajaffer

Forms/Enabling-Edit-Option-for-the-PdfComboboxField/Enabling-Edit-Option-for-the-PdfComboboxField.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.13.35617.110 d17.13
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Enabling-Edit-Option-for-the-PdfComboboxField", "Enabling-Edit-Option-for-the-PdfComboboxField\Enabling-Edit-Option-for-the-PdfComboboxField.csproj", "{B042DC77-96A1-4EA8-9776-6F10B092BE24}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B042DC77-96A1-4EA8-9776-6F10B092BE24}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B042DC77-96A1-4EA8-9776-6F10B092BE24}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B042DC77-96A1-4EA8-9776-6F10B092BE24}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B042DC77-96A1-4EA8-9776-6F10B092BE24}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {BDBFE219-C7AF-4C85-A096-0F5DCDB0360E}
+	EndGlobalSection
+EndGlobal

Forms/Enabling-Edit-Option-for-the-PdfComboboxField/Enabling-Edit-Option-for-the-PdfComboboxField/Enabling-Edit-Option-for-the-PdfComboboxField.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Enabling_Edit_Option_for_the_PdfComboboxField</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Pdf.Net.Core" Version="*" />
+  </ItemGroup>
+
+</Project>

Forms/Enabling-Edit-Option-for-the-PdfComboboxField/Enabling-Edit-Option-for-the-PdfComboboxField/Output/.gitkeep

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+//Create a new PDf document
+
+using Syncfusion.Pdf;
+using Syncfusion.Pdf.Graphics;
+using Syncfusion.Pdf.Interactive;
+using Syncfusion.Drawing;
+
+PdfDocument document = new PdfDocument();
+
+//Creates a new page and adds it as the last page of the document
+
+PdfPage page = document.Pages.Add();
+
+PdfFont font = new PdfStandardFont(PdfFontFamily.Courier, 12f);
+
+//Create a combo box
+
+PdfComboBoxField positionComboBox = new PdfComboBoxField(page, "positionComboBox");
+
+positionComboBox.Editable = true;
+
+positionComboBox.Bounds = new RectangleF(100, 115, 200, 20);
+
+positionComboBox.Font = font;
+
+positionComboBox.Editable = true;
+
+//Add it to document
+
+document.Form.Fields.Add(positionComboBox);
+
+using (FileStream outputFileStream = new FileStream(Path.GetFullPath(@"../../../Output/Output.pdf"), FileMode.Create, FileAccess.ReadWrite))
+{
+    //Save the PDF document to file stream.
+    document.Save(outputFileStream);
+}
+document.Close(true);
+