<TelerikGrid 
             Data="@GridData"
             @ref="@Grid"
             Sortable="true"
             Reorderable="true"
             Resizable="true"
             Pageable="@true"
             AutoGenerateColumns ="true"
             ShowColumnMenu="true"
             FilterMode="@GridFilterMode.FilterMenu"
             OnRowDoubleClick="@OnRowDoubleClickHandler"
             SelectionMode="GridSelectionMode.Multiple" > 

    <GridToolBarTemplate>
        <GridCommandButton OnClick="@AutoFitAllColumns" Icon="@FontIcon.ColResize" Title="Spalten-Autoanpassung" Class="tooltip-target"></GridCommandButton>
        <GridCommandButton Command="ExcelExport" Icon="@SvgIcon.FileExcel">Export to Excel</GridCommandButton>
        <GridCommandButton Command="CsvExport" Icon="@SvgIcon.FileCsv">Export to CSV</GridCommandButton>
        <label class="k-checkbox-label"><TelerikCheckBox @bind-Value="@ExportAllPages" />Alle Seiten exportieren</label>
    </GridToolBarTemplate>
    <GridColumns>
        <GridCheckboxColumn></GridCheckboxColumn>
        <GridAutoGeneratedColumns ColumnWidth="200px" />
        </GridColumn>
        <GridColumn Field=@nameof(Inventory.IsFragmented)>
            <Template >
                @{
                    var x = context as Inventory;
                    var b = x.IsFragmented == true ? "Ja" : "Nein";
                }
                <p> @(x.IsFragmented ? "Ja" : "Nein")</p>
            </Template>
        </GridColumn>
        <GridColumn Field=@nameof(Inventory.Immobile) Visible="true">
            <Template>
            @{
            var x = context as Inventory;
            if (x.Immobile == true) {
                <p>Ja</p>
            } 
            else {
                <p>Nein</p>
            }
        }
<p>NEIN</p>
            </Template>
        </GridColumn>
    </GridColumns>
    <GridExport>
        <GridExcelExport FileName="ve-excel-export" AllPages="@ExportAllPages" />
        <GridCsvExport FileName="ve-csv-export" AllPages="@ExportAllPages" />
    </GridExport>
</TelerikGrid>

 using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream($"ClaimForms.Server.Shared.Images.{logoFile}.png"))
 {
     ImageSource imageSource = new ImageSource(stream, ImageQuality.High);
     CurrentEditor.DrawImage(imageSource, new Size(162, 42));
 }

app.Use(async (context, next) =>
{
    if (context.Request.Method == HttpMethods.Options)
    {
        context.Response.Headers.Add("Allow", "GET, POST, PUT, OPTIONS");
        context.Response.Headers.Add("Access-Control-Allow-Origin", "https://localhost:7053");
        context.Response.StatusCode = (int)HttpStatusCode.OK;
        return;
    }
    await next.Invoke();
});

 <TelerikUpload SaveUrl="@saveURL"
                RemoveUrl="https://localhost:7121/api/DocumentUpload/remove"
                MaxFileSize="@MaxFileSize"
                />

using DocumentFormat.OpenXml.Drawing;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace API.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class DocumentUploadController : ControllerBase
    {
        public IWebHostEnvironment HostingEnvironment { get; set; }

        public DocumentUploadController(IWebHostEnvironment hostingEnvironment)
        {
            HostingEnvironment = hostingEnvironment;
        }

        

        [HttpPost("save")]
        public async Task<IActionResult> Save(IFormFile files) // "files" matches the Upload SaveField value
        {
            if (files != null)
            {
                try
                {
                    // save to wwwroot - Blazor Server only
                    //var rootPath = HostingEnvironment.WebRootPath;
                    // save to Server project root - Blazor Server or WebAssembly
                    var rootPath = HostingEnvironment.ContentRootPath;
                    var newFolder = Guid.NewGuid().ToString();
                    System.IO.Directory.CreateDirectory(rootPath + newFolder);
                    var saveLocation = System.IO.Path.Combine(rootPath + newFolder, files.FileName);

                    using (var fileStream = new FileStream(saveLocation, FileMode.Create))
                    {
                        await files.CopyToAsync(fileStream);
                    }
                }
                catch (Exception ex)
                {
                    Response.StatusCode = 500;
                    await Response.WriteAsync($"Upload failed.");
                }
            }

            return new OkResult();
        }

        [HttpPost("remove")]
        public async Task<IActionResult> Remove([FromForm] string files) // "files" matches the Upload RemoveField value
        {
            if (files != null)
            {
                try
                {
                    // delete from wwwroot - Blazor Server only
                    var rootPath = HostingEnvironment.WebRootPath;
                    // delete from Server project root - Blazor Server or WebAssembly
                    //var rootPath = HostingEnvironment.ContentRootPath;
                    var fileLocation = System.IO.Path.Combine(rootPath, files);

                    if (System.IO.File.Exists(fileLocation))
                    {
                        System.IO.File.Delete(fileLocation);
                    }
                }
                catch (Exception ex)
                {
                    Response.StatusCode = 500;
                    await Response.WriteAsync($"Delete failed.");
                }
            }

            return new EmptyResult();
        }
    }
}