How to Import Excel to GridView in ASP.NET C#

How Do You Install IronXL for Excel GridView Integration?

Before writing any code, you need to add IronXL to your ASP.NET project. The quickest path is NuGet, either from the Visual Studio Package Manager Console or the .NET CLI.

Install-Package IronXL
dotnet add package IronXL

Install-Package IronXL
dotnet add package IronXL

Once installed, NuGet adds all required references to your project. There are no external drivers to install, no OLEDB providers to register, and no Microsoft Office dependency on the server. The library ships as a single managed assembly and works on Windows, Linux, macOS, and cloud hosting environments including Azure App Service.

After installation, add the following namespaces to any code-behind file that reads or writes Excel data:

using IronXL;
using System.Data;
using System.IO;

using IronXL;
using System.Data;
using System.IO;

Imports IronXL
Imports System.Data
Imports System.IO

IronXL supports both .xls (Excel 97-2003) and .xlsx (Excel 2007+) formats, so you do not need separate handling for each file type. The same WorkBook.Load call handles either format by inspecting the file signature automatically.

What Is the Fastest Way to Load Excel Data into a GridView?

The fastest method combines WorkBook.Load, sheet.ToDataTable, and GridView.DataBind into about four lines of effective code. No manual column creation and no row iteration are required for basic scenarios.

using IronXL;
using System.Data;

WorkBook workBook = WorkBook.Load("data.xlsx");
WorkSheet sheet = workBook.DefaultWorkSheet;

// true = treat first row as column headers
DataTable dataTable = sheet.ToDataTable(true);

GridView1.DataSource = dataTable;
GridView1.DataBind();

using IronXL;
using System.Data;

WorkBook workBook = WorkBook.Load("data.xlsx");
WorkSheet sheet = workBook.DefaultWorkSheet;

// true = treat first row as column headers
DataTable dataTable = sheet.ToDataTable(true);

GridView1.DataSource = dataTable;
GridView1.DataBind();

Imports IronXL
Imports System.Data

Dim workBook As WorkBook = WorkBook.Load("data.xlsx")
Dim sheet As WorkSheet = workBook.DefaultWorkSheet

' True = treat first row as column headers
Dim dataTable As DataTable = sheet.ToDataTable(True)

GridView1.DataSource = dataTable
GridView1.DataBind()

The ToDataTable(true) call tells IronXL to promote the first row of the worksheet to column names in the resulting DataTable. When you bind that table to a GridView with AutoGenerateColumns="true", ASP.NET creates one column per Excel header automatically.

How Do You Create an ASP.NET Web Forms Page to Import Excel?

A minimal import page needs three controls: a file-upload input, a submit button, and the GridView. Add the following ASPX markup inside your <form runat="server"> element:

<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="Upload Excel File"
    OnClick="btnUpload_Click" />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="true"
    CssClass="table table-bordered" />

<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="Upload Excel File"
    OnClick="btnUpload_Click" />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="true"
    CssClass="table table-bordered" />

<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="Upload Excel File" OnClick="btnUpload_Click" />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="true" CssClass="table table-bordered" />

The CssClass attribute wires the grid into your Bootstrap stylesheet if you are using one, giving you styled rows and borders without extra configuration.

In the code-behind, handle the button click event. The pattern below saves the uploaded file to a temporary server path, loads it with IronXL, and binds the resulting DataTable to the grid:

using IronXL;
using System.Data;
using System.IO;

void btnUpload_Click(object sender, EventArgs e)
{
    if (!FileUpload1.HasFile) return;

    string uploadDir = Server.MapPath("~/Uploads/");
    Directory.CreateDirectory(uploadDir); // ensure directory exists

    string filePath = Path.Combine(uploadDir, Path.GetFileName(FileUpload1.FileName));
    FileUpload1.SaveAs(filePath);

    WorkBook workBook = WorkBook.Load(filePath);
    WorkSheet sheet = workBook.DefaultWorkSheet;
    DataTable dt = sheet.ToDataTable(true);

    GridView1.DataSource = dt;
    GridView1.DataBind();

    // Store for later export operations
    Session["CurrentData"] = dt;
}

using IronXL;
using System.Data;
using System.IO;

void btnUpload_Click(object sender, EventArgs e)
{
    if (!FileUpload1.HasFile) return;

    string uploadDir = Server.MapPath("~/Uploads/");
    Directory.CreateDirectory(uploadDir); // ensure directory exists

    string filePath = Path.Combine(uploadDir, Path.GetFileName(FileUpload1.FileName));
    FileUpload1.SaveAs(filePath);

    WorkBook workBook = WorkBook.Load(filePath);
    WorkSheet sheet = workBook.DefaultWorkSheet;
    DataTable dt = sheet.ToDataTable(true);

    GridView1.DataSource = dt;
    GridView1.DataBind();

    // Store for later export operations
    Session["CurrentData"] = dt;
}

Imports IronXL
Imports System.Data
Imports System.IO

Sub btnUpload_Click(sender As Object, e As EventArgs)
    If Not FileUpload1.HasFile Then Return

    Dim uploadDir As String = Server.MapPath("~/Uploads/")
    Directory.CreateDirectory(uploadDir) ' ensure directory exists

    Dim filePath As String = Path.Combine(uploadDir, Path.GetFileName(FileUpload1.FileName))
    FileUpload1.SaveAs(filePath)

    Dim workBook As WorkBook = WorkBook.Load(filePath)
    Dim sheet As WorkSheet = workBook.DefaultWorkSheet
    Dim dt As DataTable = sheet.ToDataTable(True)

    GridView1.DataSource = dt
    GridView1.DataBind()

    ' Store for later export operations
    Session("CurrentData") = dt
End Sub

This implementation follows top-level statements style for the logic inside the event handler while retaining the required Web Forms event signature. Notice that Directory.CreateDirectory is called defensively -- if the Uploads folder already exists, the call is a no-op.

After the user selects a .xlsx file and clicks the upload button, the grid populates with the spreadsheet contents. Column names come from the first row of the Excel file, and all subsequent rows become data rows in the grid.

string ext = Path.GetExtension(FileUpload1.FileName).ToLowerInvariant();
string[] allowed = { ".xls", ".xlsx" };

if (!allowed.Contains(ext))
{
    lblError.Text = "Only .xls and .xlsx files are accepted.";
    return;
}

string ext = Path.GetExtension(FileUpload1.FileName).ToLowerInvariant();
string[] allowed = { ".xls", ".xlsx" };

if (!allowed.Contains(ext))
{
    lblError.Text = "Only .xls and .xlsx files are accepted.";
    return;
}

Imports System.IO

Dim ext As String = Path.GetExtension(FileUpload1.FileName).ToLowerInvariant()
Dim allowed As String() = {".xls", ".xlsx"}

If Not allowed.Contains(ext) Then
    lblError.Text = "Only .xls and .xlsx files are accepted."
    Return
End If

How Do You Access Specific Worksheets and Cell Ranges?

When an Excel workbook contains multiple sheets, you need to target a specific one by name rather than relying on DefaultWorkSheet. IronXL provides a GetWorkSheet method that accepts the sheet tab name as a string.

using IronXL;
using System.Data;

WorkBook workBook = WorkBook.Load("sales-report.xlsx");

// Access a named sheet
WorkSheet salesSheet = workBook.GetWorkSheet("Q4 Sales");

// Read a specific cell range
var topTen = salesSheet["A1:E11"];

// Convert the entire workbook to a DataSet (one DataTable per sheet)
DataSet allSheets = workBook.ToDataSet();

// Bind the first sheet's DataTable to the grid
GridView1.DataSource = allSheets.Tables[0];
GridView1.DataBind();

using IronXL;
using System.Data;

WorkBook workBook = WorkBook.Load("sales-report.xlsx");

// Access a named sheet
WorkSheet salesSheet = workBook.GetWorkSheet("Q4 Sales");

// Read a specific cell range
var topTen = salesSheet["A1:E11"];

// Convert the entire workbook to a DataSet (one DataTable per sheet)
DataSet allSheets = workBook.ToDataSet();

// Bind the first sheet's DataTable to the grid
GridView1.DataSource = allSheets.Tables[0];
GridView1.DataBind();

Imports IronXL
Imports System.Data

Dim workBook As WorkBook = WorkBook.Load("sales-report.xlsx")

' Access a named sheet
Dim salesSheet As WorkSheet = workBook.GetWorkSheet("Q4 Sales")

' Read a specific cell range
Dim topTen = salesSheet("A1:E11")

' Convert the entire workbook to a DataSet (one DataTable per sheet)
Dim allSheets As DataSet = workBook.ToDataSet()

' Bind the first sheet's DataTable to the grid
GridView1.DataSource = allSheets.Tables(0)
GridView1.DataBind()

The ToDataSet method is useful when your application needs to display data from multiple sheets or let the user choose which sheet to view. Each DataTable in the returned DataSet corresponds to one Excel worksheet, and the table name matches the sheet tab name.

DataTable dt = sheet.ToDataTable(true);
DataView dv = new DataView(dt)
{
    RowFilter = "Status = 'Active'"
};

GridView1.DataSource = dv;
GridView1.DataBind();

DataTable dt = sheet.ToDataTable(true);
DataView dv = new DataView(dt)
{
    RowFilter = "Status = 'Active'"
};

GridView1.DataSource = dv;
GridView1.DataBind();

Dim dt As DataTable = sheet.ToDataTable(True)
Dim dv As New DataView(dt) With {
    .RowFilter = "Status = 'Active'"
}

GridView1.DataSource = dv
GridView1.DataBind()

How Do You Compare Import Methods for Excel GridView Binding?

Different approaches to Excel-to-GridView binding have distinct trade-offs. The table below summarizes the most common methods so you can choose the right one for your scenario.

IronXL covers both legacy XLS and modern XLSX formats, requires no server-side driver installation, and provides the lowest code complexity of the options listed. For teams that already use other Iron Software products such as IronPDF or IronOCR, a single Iron Software license covers the full suite.

How Do You Export GridView Data Back to Excel?

Completing the round-trip -- from Excel into a grid and back to Excel -- is equally concise with IronXL. This pattern is useful for "download as Excel" buttons that let users export whatever is currently displayed in the grid.

void btnExport_Click(object sender, EventArgs e)
{
    DataTable dt = Session["CurrentData"] as DataTable;
    if (dt == null) return;

    WorkBook workBook = WorkBook.Create(ExcelFileFormat.XLSX);
    WorkSheet ws = workBook.CreateWorkSheet("Export");

    // Write header row
    for (int col = 0; col < dt.Columns.Count; col++)
        ws.SetCellValue(0, col, dt.Columns[col].ColumnName);

    // Write data rows
    for (int row = 0; row < dt.Rows.Count; row++)
        for (int col = 0; col < dt.Columns.Count; col++)
            ws.SetCellValue(row + 1, col, dt.Rows[row][col]?.ToString() ?? string.Empty);

    string exportDir = Server.MapPath("~/Exports/");
    Directory.CreateDirectory(exportDir);
    string exportPath = Path.Combine(exportDir, "export.xlsx");
    workBook.SaveAs(exportPath);

    Response.Clear();
    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
    Response.AddHeader("Content-Disposition", "attachment; filename=export.xlsx");
    Response.TransmitFile(exportPath);
    Response.End();
}

void btnExport_Click(object sender, EventArgs e)
{
    DataTable dt = Session["CurrentData"] as DataTable;
    if (dt == null) return;

    WorkBook workBook = WorkBook.Create(ExcelFileFormat.XLSX);
    WorkSheet ws = workBook.CreateWorkSheet("Export");

    // Write header row
    for (int col = 0; col < dt.Columns.Count; col++)
        ws.SetCellValue(0, col, dt.Columns[col].ColumnName);

    // Write data rows
    for (int row = 0; row < dt.Rows.Count; row++)
        for (int col = 0; col < dt.Columns.Count; col++)
            ws.SetCellValue(row + 1, col, dt.Rows[row][col]?.ToString() ?? string.Empty);

    string exportDir = Server.MapPath("~/Exports/");
    Directory.CreateDirectory(exportDir);
    string exportPath = Path.Combine(exportDir, "export.xlsx");
    workBook.SaveAs(exportPath);

    Response.Clear();
    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
    Response.AddHeader("Content-Disposition", "attachment; filename=export.xlsx");
    Response.TransmitFile(exportPath);
    Response.End();
}

Imports System
Imports System.Data
Imports System.IO

Sub btnExport_Click(sender As Object, e As EventArgs)
    Dim dt As DataTable = TryCast(Session("CurrentData"), DataTable)
    If dt Is Nothing Then Return

    Dim workBook As WorkBook = WorkBook.Create(ExcelFileFormat.XLSX)
    Dim ws As WorkSheet = workBook.CreateWorkSheet("Export")

    ' Write header row
    For col As Integer = 0 To dt.Columns.Count - 1
        ws.SetCellValue(0, col, dt.Columns(col).ColumnName)
    Next

    ' Write data rows
    For row As Integer = 0 To dt.Rows.Count - 1
        For col As Integer = 0 To dt.Columns.Count - 1
            ws.SetCellValue(row + 1, col, If(dt.Rows(row)(col)?.ToString(), String.Empty))
        Next
    Next

    Dim exportDir As String = Server.MapPath("~/Exports/")
    Directory.CreateDirectory(exportDir)
    Dim exportPath As String = Path.Combine(exportDir, "export.xlsx")
    workBook.SaveAs(exportPath)

    Response.Clear()
    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
    Response.AddHeader("Content-Disposition", "attachment; filename=export.xlsx")
    Response.TransmitFile(exportPath)
    Response.End()
End Sub

The Response.TransmitFile call streams the saved file to the browser, triggering a download dialog. The Content-Disposition: attachment header ensures browsers download rather than attempt to display the file inline.

// Bold the header row
ws["A1:Z1"].Style.Font.Bold = true;

// Apply a currency format to column C (index 2), rows 2 onward
ws[$"C2:C{dt.Rows.Count + 1}"].FormatString = IronXL.Styles.BuiltinFormats.Accounting2;

// Auto-fit column widths (IronXL approximates based on content length)
ws.AutoSizeColumn(0);
ws.AutoSizeColumn(1);

// Bold the header row
ws["A1:Z1"].Style.Font.Bold = true;

// Apply a currency format to column C (index 2), rows 2 onward
ws[$"C2:C{dt.Rows.Count + 1}"].FormatString = IronXL.Styles.BuiltinFormats.Accounting2;

// Auto-fit column widths (IronXL approximates based on content length)
ws.AutoSizeColumn(0);
ws.AutoSizeColumn(1);

' Bold the header row
ws("A1:Z1").Style.Font.Bold = True

' Apply a currency format to column C (index 2), rows 2 onward
ws($"C2:C{dt.Rows.Count + 1}").FormatString = IronXL.Styles.BuiltinFormats.Accounting2

' Auto-fit column widths (IronXL approximates based on content length)
ws.AutoSizeColumn(0)
ws.AutoSizeColumn(1)

What Are Your Next Steps?

You now have a complete, driver-free pipeline for importing Excel files into an ASP.NET GridView and exporting GridView data back to Excel using IronXL. Here is what to explore next to build on this foundation:

• Read the IronXL documentation for the full API reference, including formula evaluation, cell range operations, and chart creation.
• Explore the IronXL code examples library for ready-to-run snippets covering CSV import, password-protected workbooks, conditional formatting, and more.
• Try the Excel to DataTable tutorial if you want deeper coverage of typed column mapping and null handling.
• Check the IronXL licensing page to review options from development licenses to OEM redistribution.
• Review Iron Software's .NET Excel reading guide to understand workbook and worksheet navigation in detail.
• Compare IronXL with alternatives using the C# Excel library comparison for a feature-by-feature breakdown against OLEDB, EPPlus, and the Open XML SDK.

For .NET Core and ASP.NET Core applications, the same IronXL API works in Razor Pages and MVC controllers. The IronXL ASP.NET Core guide walks through the differences in file upload handling and dependency injection patterns.

If you are integrating IronXL alongside document generation, the IronPDF integration guide shows how to export GridView data to a PDF report in addition to Excel -- useful for applications that need both formats.

Start with the IronXL free trial to test all features in your project before purchasing. No credit card is required for the trial license.