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:

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")
                    If ((j = 2) And (i < 2)) Then
                        xlsTable.easy_getCell(i, j).setValue("1000")
                        xlsTable.easy_getCell(i, j).setValue("9")
                    End If

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

        ' 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( _

        ' 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...")
            Console.Write(vbCrLf & "Error encountered: " & sError & vbCrLf & "Press Enter to Exit...")
        End If
        ' Dispose memory

    End Sub

End Module

EasyXLS Excel libraries:

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