902922: Fix playground issues

Create and Edit Charts/Axis/.NET/Axis/Axis/Program.cs

@@ -1,6 +1,5 @@
 using Syncfusion.XlsIO;
 using Syncfusion.Drawing;
-using static System.Net.Mime.MediaTypeNames;
 using System.Drawing;
 
 namespace Axis

Create and Edit Charts/Pattern Fill/.NET/Pattern Fill/Pattern Fill/Program.cs

@@ -1,7 +1,6 @@
 using Syncfusion.XlsIO;
 using Syncfusion.XlsIO.Implementation.Charts;
 using Syncfusion.Drawing;
-using static System.Net.Mime.MediaTypeNames;
 using Image = Syncfusion.Drawing.Image;
 
 namespace Pattern_Fill

Editing Excel cell-styles/HTML String Formatting/.NET/HTML String Formatting/HTML String Formatting/Program.cs

@@ -1,6 +1,6 @@
 // See https://aka.ms/new-console-template for more information
 using Syncfusion.XlsIO;
-using static System.Net.Mime.MediaTypeNames;
+
 
 using (ExcelEngine excelEngine = new ExcelEngine())
 {

Pictures in Excel/Move and Size with cells/.NET/Move and Size with cells/Move and Size with cells/Program.cs

@@ -29,7 +29,7 @@ public static void Main(string[] args)
                 worksheet.HideColumn(5);
 
                 //Saving the workbook as stream
-                FileStream OutputStream = new FileStream("Output.xlsx", FileMode.Create, FileAccess.ReadWrite);
+                FileStream OutputStream = new FileStream(Path.GetFullPath(@"Output/Output.xlsx"), FileMode.Create, FileAccess.ReadWrite);
                 workbook.SaveAs(OutputStream);
 
                 //Dispose streams

Pivot Table/Layout/Layout/Program.cs

@@ -1,4 +1,5 @@
 using Syncfusion.XlsIO;
+using Syncfusion.XlsIO.Implementation.PivotTables;
 
 namespace Layout
 {
@@ -19,7 +20,7 @@ public static void Main(String[] args)
 
                 string fileName = "PivotTable_Layout.xlsx";
                 //Saving the workbook as stream
-                FileStream stream = new FileStream(fileName, FileMode.Create, FileAccess.ReadWrite);
+                FileStream stream = new FileStream(Path.GetFullPath(@"Output/PivotTable_Layout.xlsx"), FileMode.Create, FileAccess.ReadWrite);
                 workbook.SaveAs(stream);
                 stream.Dispose();
             }

What-If Analysis/Apply Scenario/.NET/Apply Scenario/Apply Scenario/Program.cs

@@ -1,7 +1,6 @@
 using System.IO;
 using Syncfusion.XlsIO;
 using System;
-using static System.Net.Mime.MediaTypeNames;
 
 namespace Apply_Scenario
 {
@@ -35,7 +34,7 @@ static void Main(string[] args)
                     newSheet.Name = scenarios[pos].Name;
 
                     //Saving the new workbook as a stream
-                    using (FileStream stream = new FileStream(scenarios[pos].Name + ".xlsx", FileMode.Create, FileAccess.ReadWrite))
+                    using (FileStream stream = new FileStream(Path.GetFullPath(@"Output/" + scenarios[pos].Name + ".xlsx"), FileMode.Create, FileAccess.ReadWrite))
                     {
                         newBook.SaveAs(stream);
                     }

What-If Analysis/Hide Scenario/.NET/Hide Scenario/Hide Scenario/Program.cs

@@ -1,7 +1,6 @@
 using System.IO;
 using Syncfusion.XlsIO;
 using System;
-using static System.Net.Mime.MediaTypeNames;
 
 namespace Hide_Scenario
 {

What-If Analysis/Protect Scenario/.NET/Protect Scenario/Protect Scenario/Program.cs

@@ -1,7 +1,6 @@
 using System.IO;
 using Syncfusion.XlsIO;
 using System;
-using static System.Net.Mime.MediaTypeNames;
 
 namespace Protect_Scenario
 {

Worksheet Features/Copy Column/.NET/Copy Column/Copy Column/Program.cs

@@ -2,7 +2,6 @@
 using Syncfusion.XlsIO.Implementation.Collections;
 using Syncfusion.XlsIO.Implementation;
 using Syncfusion.XlsIO.Interfaces;
-using static System.Net.Mime.MediaTypeNames;
 
 namespace Copy_Column
 {

Worksheet Features/Header and Footer/.NET/Header and Footer/Header and Footer/Program.cs

@@ -31,7 +31,7 @@ static void Main(string[] args)
                 worksheet.PageSetup.RightFooter = "&P &K0000FF Right Footer";
 
                 //Saving the workbook as stream
-                FileStream stream = new FileStream("Output.xlsx", FileMode.Create);
+                FileStream stream = new FileStream(Path.GetFullPath("Output/Output.xlsx"), FileMode.Create);
                 workbook.SaveAs(stream);
                 stream.Dispose();
             }

Worksheet Features/PrintTitleColumns/.NET/PrintTitleColumns/PrintTitleColumns/Program.cs

@@ -1,6 +1,5 @@
 using System.IO;
 using Syncfusion.XlsIO;
-using static System.Net.Mime.MediaTypeNames;
 
 namespace PrintTitleColumns
 {

Worksheet Features/PrintTitleRows/.NET/PrintTitleRows/PrintTitleRows/Program.cs

@@ -1,6 +1,5 @@
 using System.IO;
 using Syncfusion.XlsIO;
-using static System.Net.Mime.MediaTypeNames;
 
 namespace PrintTitleRows
 {