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The ASP.NET Core HeatMap Chart is a graphical representation of two-dimensional data where values are represented with gradient or solid color variations. The data points are rendered as HeatMap cells using Scalable Vector Graphics (SVG) or canvas UI rendering.

Dealing with large data

Though the ASP.NET Core HeatMap chart can render data points using both SVG and canvas modes, it uses canvas rendering mode while displaying large volumes of data for the best initial load performance and optimized memory usage.

Data binding

The HeatMap Chart can be bound to data using JSON or an array of objects. JSON data can be local or remote, and it can be retrieved using different adaptors. The JSON data can be nested as well.

Data Binding in ASP.NET Core HeatMap Chart


In the HeatMap Chart, the cell selection is used to select single or multiple cells at runtime. The selected cell details are obtained via the built-in event and can be used for external processing.

Selection in ASP.NET Core HeatMap Chart

Bubble HeatMap Chart

The ASP.NET Core bubble HeatMap Chart or the matrix bubble chart, visualizes data using variations in bubble attributes such as size, color, and sector.

Bubble HeatMap Chart in ASP.NET Core HeatMap Chart

Calendar HeatMap

The ASP.NET Core calendar HeatMap visualizes time series data with each data point representing a value bound to a specific time.


Populate data in the ASP.NET Core HeatMap Chart using different axis types: numeric, category, and date-time.

Numeric axis

Use a numeric axis to represent numeric data in a HeatMap.

Date-time axis

Use a date-time axis to represent time series data in a HeatMap. Similarly, display dates and times as axis labels with different formats.

Category axis

Use a category axis to represent non-numerical data in a HeatMap and display text labels instead of numbers.

Customizable axis

The ASP.NET Core HeatMap Chart allows you to customize axis elements to make an axis more readable.

ASP.NET Core HeatMap Chart with inversed origin or inversed axes

Inversed axis

Achieve RTL layout by reversing the axis labels. This swaps the higher and lower ranges of an axis.

ASP.NET Core HeatMap Chart with axes displayed in opposed position

Opposed position

Arrange the axes smartly by moving them to positions opposite to their default positions.

Axis intervals displayed in ASP.NET Core HeatMap Chart

Axis intervals

Set axis labels with regular intervals, hiding adjacent labels across all types of axes.

Label rotation of the ASP.NET Core HeatMap Chart axes

Axis label rotation

Rotate axis labels clockwise or counterclockwise to any desired angle.

Axis label formatting in ASP.NET Core HeatMap Chart

Axis label formatting

Customize the axis label text using the available formatting options.

HeatMap cell customization

Customize the default appearance of a cell or data point using the available formatting options.

Data labels in ASP.NET Core HeatMap Chart

Data label

Toggle visibility or format the data labels to display custom text along with the cell values.

ASP.NET Core HeatMap Chart cell with customized borders


Change the borders and cell spacing by customizing the border settings.


Customize the default color settings of the HeatMap cells with gradient or solid custom colors.

Cell color range customization

Color ranges allow a color to be applied to specific ranges in heatmap cells.

Asp.NET Core HeatMap Chart with cell color range customization.


Display additional information about data points in the ASP.NET CORE HeatMap Chart using a legend.

ASP.NET Core HeatMap Chart with a gradient legend and a list-type legend


Choose between a gradient pointer and a list-type legend for improving data points readability.

Legend placement in ASP.NET Core HeatMap Chart


Place the legend anywhere in the chart area to make it fit best on a page.

Legend paging enabled in ASP.NET Core HeatMap Chart


The control enables paging when legend items exceed the bounds. Then, each legend item can be viewed by navigating between the pages.

Legend title customization in ASP.NET Core HeatMap Chart.

Legend title

A legend title provides information about the heatmap legend.

Empty points

Handle missed or undefined data values with empty data points.

ASP.NET Core HeatMap Chart with empty data points


Display additional information for the data points with tooltips on mouse hover.

Cell tooltip enabled in ASP.NET Core HeatMap Chart

Other supported frameworks

The HeatMap Chart is also available in Blazor, Angular, React, Vue, and JavaScript frameworks. Check out the different HeatMap Chart platforms from the links below,

ASP.NET Core HeatMap Chart Code Example

Easily get started with the ASP.NET Core HeatMap Chart using a few simple lines of CSHTML and C# code, as demonstrated below. Also explore our ASP.NET Core HeatMap Chart Example that shows you how to render and configure the HeatMap Chart in ASP.NET Core.

    <ejs-heatmap id='container' dataSource="ViewBag.dataSource">
        <e-heatmap-titlesettings text="Sales Revenue per Employee (in 1000 US$)">
        <e-heatmap-xaxis labels="ViewBag.xlabels">
        <e-heatmap-yaxis labels="ViewBag.yLabels">
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Newtonsoft.Json;
namespace ApplicationName.Controllers
    public class HomeController : Controller
        public IActionResult Index()
            string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
            ViewBag.xLabels = xlabels;
            string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
            ViewBag.yLabels = yLabels;
            ViewBag.dataSource = GetDataSource();
            return View();
        private int[,] GetDataSource()
            int[,] data = new int[,]
                {73, 39, 26, 39, 94, 0},
                {93, 58, 53, 38, 26, 68},
                {99, 28, 22, 4, 66, 90},
                {14, 26, 97, 69, 69, 3},
                {7, 46, 47, 47, 88, 6},
                {41, 55, 73, 23, 3, 79},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            return data;


Frequently Asked Questions

The HeatMap Chart in ASP.NET Core Syncfusion provides the following features:

  • Display simple or large matrix data graphically.
  • Supports automatic switching between SVG and Canvas rendering modes.
  • Legend provides value information for the colors which represents each values.
  • Analyze data patterns of the subject quickly with multiple views such as rectangle, bubble, calendar, and sector heatmaps.
  • One of the best ASP.NET Core HeatMap Chart in the market that offers feature-rich UI to interact with the software.
  • Simple configuration and API.
  • Supports all modern browsers.
  • Mobile-touch friendly and responsive.
  • Expansive learning resources such as demos and documentation to let you get started quickly with ASP.NET Core HeatMap Chart.

You can find our ASP.NET Core HeatMap Chart demo, which demonstrates how to render and configure the HeatMap Chart.

No, this is a commercial product and requires a paid license. However, a free community license is also available for companies and individuals whose organizations have less than $1 million USD in annual gross revenue and five or fewer developers.

A good place to start would be our comprehensive getting started documentation.

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