@{
    ViewData["Title"] = "UploadCSV";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
@using System.Data;
@model DataTable
<h1>UploadCSV</h1>

 <form asp-controller="Home" asp-action="UploadCSV" method="post" enctype="multipart/form-data">
        <input type="file" name="postedFile" />
        <input type="submit" value="Import" />
    </form>
    @if (Model != null)
    {
        <hr />
        <table border="0" cellpadding="0" cellspacing="0">
            <tr>
                @foreach (DataColumn dc in Model.Columns)
                {
                    <th>@dc.ColumnName</th>
                }
            </tr>
            @foreach (DataRow dr in Model.Rows)
            {
                <tr>
                    @foreach (DataColumn dc in Model.Columns)
                    {
                        <td>@dr[dc.ColumnName]</td>
                    }
                </tr>
            }
        </table>
    }

Controller:

        public IActionResult UploadCSV()
        {
            return View();
        }
        [HttpPost]
        public IActionResult UploadCSV(IFormFile postedFile)
        {
            if (postedFile != null)
            {
                string path = Path.Combine(this._env.WebRootPath, "files");
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                } 
                string fileName = Path.GetFileName(postedFile.FileName);
                string filePath = Path.Combine(path, fileName);
                using (FileStream stream = new FileStream(filePath, FileMode.Create))
                {
                    postedFile.CopyTo(stream);
                }
                var csvData = System.IO.File.ReadAllText(filePath).ToString();
                DataTable dt = new DataTable();
                bool firstRow = true;
                if(csvData.Length > 0)
                { 
                    foreach (string row in csvData.Split('\n'))
                    {
                        if (!string.IsNullOrEmpty(row))
                        {
                            if (!string.IsNullOrEmpty(row))
                            {
                                if (firstRow)
                                {
                                    foreach (string cell in row.Split(','))
                                    {
                                        dt.Columns.Add(cell.Trim());
                                    }
                                    firstRow = false;
                                }
                                else
                                {
                                    dt.Rows.Add();
                                    int i = 0;
                                    foreach (string cell in row.Split(','))
                                    {
                                        dt.Rows[dt.Rows.Count - 1][i] = cell.Trim();
                                        i++;
                                    }
                                }
                            }
                        }
                    } 
                }
                return View(dt);
            }

            return View();
        }