public async Task<IActionResult> GetTblRequestData([FromRoute] int id)
{
    if (!ModelState.IsValid)
    {
        return BadRequest(ModelState);
    }

    var tblRequestData = await _context.TblRequestData.SingleOrDefaultAsync(m => m.Request == id);

    if (tblRequestData == null)
    {
        return NotFound();
    }

    return Ok(tblRequestData);
}

<ul class="list-group">
                <li class="list-group-item">Request ID: {{request_Id}}</li>
                <li class="list-group-item">Tracking Number: {{tracking_number}}</li>
                <li class="list-group-item">Company: {{company_no}}</li>
                <li class="list-group-item">Customer Number: {{customer_no}}</li>