PM> Install-Package Spire.XLS

using Spire.Xls;
using Spire.Xls.Core;
using Spire.Xls.Core.Spreadsheet.Collections;
using System.Drawing;

namespace HighlightValues
{
    class Program
    {
        static void Main(string[] args)
        {
            {

                //Create a Workbook instance
                Workbook workbook = new Workbook();

                //Load a sample Excel document
                workbook.LoadFromFile("sample.xlsx");

                //Get the first worksheet
                Worksheet sheet = workbook.Worksheets[0];

                //Add a conditional format to the worksheet
                XlsConditionalFormats format = sheet.ConditionalFormats.Add();

                //Set the range where the conditional format will be applied
                format.AddRange(sheet.Range["B2:F7"]);

                //Apply conditional formatting to highlight the highest values
                IConditionalFormat condition1 = format.AddTopBottomCondition(TopBottomType.Top, 1);
                condition1.BackColor = Color.Red;

                //Apply conditional formatting to highlight the bottom two values
                IConditionalFormat condition2 = format.AddTopBottomCondition(TopBottomType.Bottom, 2);
                condition2.BackColor = Color.ForestGreen;

                //Save the result document
                workbook.SaveToFile("TopBottomValues.xlsx", ExcelVersion.Version2013);

            }
        }
    }
}

Imports Spire.XLS
Imports Spire.XLS.Core
Imports Spire.XLS.Core.Spreadsheet.Collections
Imports System.Drawing

Namespace HighlightValues
    Class Program
        Private Shared Sub Main(ByVal args() As String)
            'Create a Workbook instance
            Dim workbook As Workbook = New Workbook

            'Load a sample Excel document
            workbook.LoadFromFile("sample.xlsx")

            'Get the first worksheet
            Dim sheet As Worksheet = workbook.Worksheets(0)

            'Add a conditional format to the worksheet
            Dim format As XlsConditionalFormats = sheet.ConditionalFormats.Add

            'Set the range where the conditional format will be applied
            format.AddRange(sheet.Range("B2:F7"))

            'Apply conditional formatting to highlight the highest values
            Dim condition1 As IConditionalFormat = format.AddTopBottomCondition(TopBottomType.Top, 1)
            condition1.BackColor = Color.Red

            'Apply conditional formatting to highlight the bottom two values
            Dim condition2 As IConditionalFormat = format.AddTopBottomCondition(TopBottomType.Bottom, 2)
            condition2.BackColor = Color.ForestGreen

            'Save the result document
            workbook.SaveToFile("TopBottomValues.xlsx", ExcelVersion.Version2013)
        End Sub
    End Class
End Namespace

PM> Install-Package Spire.XLS

using System.IO;
using System.Text;
using Spire.Xls;
using Spire.Xls.Core;

namespace Extracttext
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Workbook object
            Workbook workbook = new Workbook();

            //Load the Excel file
            workbook.LoadFromFile("sample.xlsx");

            //Get the first worksheet
            Worksheet sheet = workbook.Worksheets[0];

            //Get the second shape and extract text from it
            IPrstGeomShape shape1 = sheet.PrstGeomShapes[1];
            string s = shape1.Text;

            //Append the extracted text to StringBuilder object
            StringBuilder sb = new StringBuilder();
            sb.AppendLine(s);

            //Write the text to a .txt file
            File.WriteAllText("ShapeText.txt", sb.ToString());
            workbook.Dispose();
        }
    }
}

Imports System.IO
Imports System.Text
Imports Spire.Xls
Imports Spire.Xls.Core

Namespace Extracttext
    
    Class Program
        
        Private Shared Sub Main(ByVal args() As String)

            'Create a Workbook object
            Dim workbook As Workbook = New Workbook

            'Load the Excel file
            workbook.LoadFromFile("sample.xlsx")

            'Get the first worksheet
            Dim sheet As Worksheet = workbook.Worksheets(0)

            'Get the second shape and extract text from it
            Dim shape1 As IPrstGeomShape = sheet.PrstGeomShapes(1)
            Dim s As String = shape1.Text

            'Append the extracted text to StringBuilder object
            Dim sb As StringBuilder = New StringBuilder
            sb.AppendLine(s)

            'Write the text to a .txt file
            File.WriteAllText("ShapeText.txt", sb.ToString)
            workbook.Dispose
        End Sub
    End Class
End Namespace

using System.Drawing;
using System.Drawing.Imaging;
using Spire.Xls;
using Spire.Xls.Core;

namespace Extractimage
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Workbook object
            Workbook workbook = new Workbook();

            //Load the Excel file
            workbook.LoadFromFile("sample.xlsx");

            //Get the first worksheet
            Worksheet sheet = workbook.Worksheets[0];

            //Get the first shape and extract the image from it
            IPrstGeomShape shape2 = sheet.PrstGeomShapes[0];
            Image image = shape2.Fill.Picture;

            //Save the extracted image to a folder
            image.Save(@"Image\ShapeImage.png", ImageFormat.Png);
            workbook.Dispose();
        }
    }
}

Imports System.Drawing
Imports System.Drawing.Imaging
Imports Spire.Xls
Imports Spire.Xls.Core

Namespace Extractimage
    
    Class Program
        
        Private Shared Sub Main(ByVal args() As String)

            'Create a Workbook object
            Dim workbook As Workbook = New Workbook

            'Load the Excel file
            workbook.LoadFromFile("sample.xlsx")

            'Get the first worksheet
            Dim sheet As Worksheet = workbook.Worksheets(0)

            'Get the first shape and extract the image from it
            Dim shape2 As IPrstGeomShape = sheet.PrstGeomShapes(0)
            Dim image As Image = shape2.Fill.Picture

            'Save the extracted image to a folder
            image.Save("Image\ShapeImage.png", ImageFormat.Png)
            workbook.Dispose
        End Sub
    End Class
End Namespace