EasyXLS

How to create conditional formatting in VB.NET

EasyXLS Excel library can be used to export Excel files in VB.NET. The library works with .NET Framework or .NET Core platform.

Step 1: Download EasyXLS Excel Library for .NET

To download the trial version of EasyXLS Excel Library, press the below button:

Download EasyXLS™ Excel Library for VB.NET

If you already own a license key, you may login and download EasyXLS from your account.

Install the downloaded EasyXLS installer for v8.6 or earlier.

Step 2: License file setup

Step required for EasyXLS v9.0 or later.

If you are using a trial, generate a trial license file from EasyXLS trials page. The trial license is valid for 30-days.

If you own a license key, you may login to the account that purchased the license and generate the license file from:
https://www.easyxls.com/my-orders

Setup the license file into your project using these guidelines.

Step 3: Create a VB.NET project

If don't have a project, create one as ASP.NET web application, windows forms app, console application, class library or service.

Step 4: Include EasyXLS library into project

EasyXLS.dll must be added as reference to your project. EasyXLS.dll can be found:
- Inside the downloaded archive at Step 1 for EasyXLS v9.0 or later
- Under installation path for EasyXLS v8.6 or earlier, in "Dot NET version" folder.

Add EasyXLS reference

Step 5: Run VB.NET code that creates conditional formatting in Excel cells

Execute the following VB.NET code that exports an Excel file and sets conditional formatting to a range. The first step is to set the range where the conditional formatting will be applied, then set the formatting options.

'-----------------------------------------------------------
' Tutorial 14
'
' This tutorial shows how to create an Excel file in VB.NET
' having a sheet and conditional formatting for cell ranges.
' ----------------------------------------------------------

Imports System.Drawing
Imports EasyXLS
Imports EasyXLS.Constants

Module Tutorial14

    Sub Main()

        Console.WriteLine("Tutorial 14" & vbCrLf & "----------" & vbCrLf)

        ' Create an instance of the class that exports Excel files having one sheet
        Dim workbook As New ExcelDocument(1)

        ' Get the table of data for the first worksheet
        Dim xlsTab As ExcelWorksheet = workbook.easy_getSheet("Sheet1")
        Dim xlsTable = xlsTab.easy_getExcelTable()

        ' Add data in cells
        For i As Integer = 0 To 5
            For j As Integer = 0 To 3
                If ((i < 2) And (j < 2)) Then
                    xlsTable.easy_getCell(i, j).setValue("12")
                Else
                    If ((j = 2) And (i < 2)) Then
                        xlsTable.easy_getCell(i, j).setValue("1000")
                    Else
                        xlsTable.easy_getCell(i, j).setValue("9")
                    End If

                    xlsTable.easy_getCell(i, j).setDataType(DataType.NUMERIC)
                End If
            Next
        Next

        ' Set conditional formatting
        xlsTab.easy_addConditionalFormatting("A1:C3", ConditionalFormatting.OPERATOR_BETWEEN, _
                "=9", "=11", True, True, Color.Red)

        ' Set another conditional formatting
        xlsTab.easy_addConditionalFormatting("A6:C6", ConditionalFormatting.OPERATOR_BETWEEN, _
                "=COS(PI())+2", "", Color.Bisque)
        xlsTab.easy_getConditionalFormattingAt("A6:C6").getConditionAt(0).setConditionType( _
                ConditionalFormatting.CONDITIONAL_FORMATTING_TYPE_EVALUATE_FORMULA)

        ' Export Excel file
        Console.WriteLine("Writing file C:\Samples\Tutorial14 - conditional formatting in Excel.xlsx.")
        workbook.easy_WriteXLSXFile("C:\Samples\Tutorial14 - conditional formatting in Excel.xlsx")

        ' Confirm export of Excel file
        Dim sError As String = workbook.easy_getError()
        If (sError.Equals("")) Then
            Console.Write(vbCrLf & "File successfully created. Press Enter to Exit...")
        Else
            Console.Write(vbCrLf & "Error encountered: " & sError & vbCrLf & "Press Enter to Exit...")
        End If
        
        ' Dispose memory
        workbook.Dispose()
        
        Console.ReadLine()

    End Sub

End Module

EasyXLS Excel libraries:

.NET
Excel Library for VB.NET
full .NET version to import, export or convert Excel files
Excel Writer for VB.NET
.NET version to create and export Excel files
Download EasyXLS™ Excel Library for VB.NET

File formats:

Office 365
MS Excel 2021 - 2024
MS Excel 2007 - 2019
MS Excel 97 - 2003
XLSXXLSMXLSBXLS
XMLHTMLCSVTXT