[Solved] ASP.Net Core MVC Error: 500 Internal Server Error when save data to database using AJAX

Hi Guys,

500 Internal Server Error when save data to database via ajax in .Net Core Mvc

I'm trying to save data using ajax. In this case I'm not use the model for save data.

is posible to save data using "Request.Form["thefield"].ToString())" because I will save data from 2 model I think this can be solve using ajax.

Any help could be apriciate.

Create.cshtml

@using www.si.perpustakaan.Models
@model PinjamanModel
@{
    ViewData["Title"] = "Create";
    Layout = "~/Views/Shared/AdminDashboard/_Layout.cshtml";
}

<link href="~/lib/bootstrap/dist/css/bootstrap.css" rel="stylesheet" />
<script src="~/lib/bootstrap/dist/js/bootstrap.js"></script>
<script type="text/javascript" src="~/lib/jquery/dist/jquery.js"></script>
<script src="~/assets/plugins/jquery-ui/jquery-ui.js"></script>
<link href="~/assets/plugins/jquery-ui/jquery-ui.css" rel="stylesheet" />
<script src="~/assets/plugins/sweetalert2/sweetalert2.js"></script>
<link href="~/assets/plugins/sweetalert2/sweetalert2.css" rel="stylesheet" />
<div class="tab-content">
    <div class="tab-pane tabs-animation fade show active" id="tab-content-0" role="tabpanel">
        <div class="row">
            <div class="col-md-12">
                <div class="main-card mb-3 card">
                    <div class="card-body">
                        <!-- Modal Header -->
                        <div class="modal-header bg bg-success">
                            <div align="center">
                                <h4 class="modal-title"><b>Add Data Pinjaman</b></h4>
                            </div>
                        </div>
                        <hr />
                        <form asp-action="" asp-controller="" method="post">
                            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
                            <div class="row">
                                <div class="col-md-6">
                                    <div class="position-relative form-group">
                                        <label asp-for="Kode_Pinjam" class="control-label"></label>
                                        <input asp-for="Kode_Pinjam" id="txtKode_Pinjam" name="Kode_Pinjam" class="form-control" readonly="readonly" />
                                        <span asp-validation-for="Kode_Pinjam" class="text-danger"></span>
                                    </div>
                                </div>

                                <div class="col-md-6">
                                    <div class="position-relative form-group">
                                        <label asp-for="Tanggal_Pinjam" class="control-label"></label>
                                        <input asp-for="Tanggal_Pinjam" class="form-control" placeholder="Enter Tanggal Pinjam Buku" />
                                        <span asp-validation-for="Tanggal_Pinjam" class="text-danger"></span>
                                    </div>
                                </div>

                                <div class="col-md-6">
                                    <div class="position-relative form-group">
                                        <label asp-for="Tanggal_Kembali" class="control-label"></label>
                                        <input asp-for="Tanggal_Kembali" class="form-control" placeholder="Enter Tanggal Kembali Buku" />
                                        <span asp-validation-for="Tanggal_Kembali" class="text-danger"></span>
                                    </div>
                                </div>

                                <div class="col-md-6">
                                    <div class="position-relative form-group">
                                        <label asp-for="Kode_Anggota" class="control-label"></label>
                                        <div class="input-group">
                                            <input asp-for="Kode_Anggota" class="form-control" id="txtKodeAnggota" placeholder="Enter Kode Anggota" required />
                                            <div class="input-group-append">
                                                <input type="submit" id="CekNamaAnggota" value="Cari Kode Anggota" class="btn btn-warning" />
                                            </div>
                                        </div>
                                        <span asp-validation-for="Kode_Anggota" class="text-danger"></span>
                                    </div>
                                </div>

                                <div class="col-md-6">
                                    <div class="position-relative form-group">
                                        <label asp-for="Nama_Anggota" class="control-label"></label>
                                        <input asp-for="Nama_Anggota" class="form-control" id="txtNamaAnggota" placeholder="Enter Nama Anggota" readonly="readonly" />
                                    </div>
                                    <span asp-validation-for="Nama_Anggota" class="text-danger"></span>
                                </div>

                                <div class="col-md-6">
                                    <div class="position-relative form-group">
                                        <label asp-for="Kode_Petugas" class="control-label"></label>
                                        <div class="input-group">
                                            <input asp-for="Kode_Petugas" class="form-control" id="txtKodePetugas" placeholder="Enter Kode Petugas" required />
                                            <div class="input-group-append">
                                                <input type="submit" id="CekNamaPetugas" value="Cari Kode Petugas" class="btn btn-warning" />
                                            </div>
                                        </div>
                                        <span asp-validation-for="Kode_Petugas" class="text-danger"></span>
                                    </div>
                                </div>

                                <div class="col-md-6">
                                    <div class="position-relative form-group">
                                        <label asp-for="Nama_Petugas" class="control-label"></label>
                                        <input asp-for="Nama_Petugas" class="form-control" id="txtNamaPetugas" placeholder="Enter Nama Petugas" readonly="readonly" />
                                    </div>
                                    <span asp-validation-for="Nama_Petugas" class="text-danger"></span>
                                </div>

                                @*Data Buku*@
                                <div class="col-md-12">
                                    <div class="main-card mb-3 card">
                                        <div class="card-body">
                                            <!-- Modal Header -->
                                            <div class="modal-header bg bg-primary">
                                                <div align="center">
                                                    <h4 class="modal-title"><b>Data Buku</b></h4>
                                                </div>
                                            </div>
                                            <hr />

                                            <table>
                                                <thead>
                                                    <tr>
                                                        <th>Kode Buku</th>
                                                        <th>Judul</th>
                                                        <th>Penulis</th>
                                                        <th>Penerbit</th>
                                                    </tr>
                                                </thead>
                                                <tbody>
                                                    <tr>
                                                        <td><input asp-for="Kode_Buku" class="form-control" placeholder="Enter Kode Buku" id="txt_Search_Kode_Buku" name="Kode_Buku" required /></td>
                                                        <td><input asp-for="Judul" class="form-control" placeholder="Enter Judul Buku" id="txtJudul" name="Judul" readonly="readonly" /></td>
                                                        <td><input asp-for="Penulis" class="form-control" placeholder="Enter Penulis" id="txtPenulis" name="Penulis" readonly="readonly" /></td>
                                                        <td><input asp-for="Penerbit" class="form-control" placeholder="Enter Penerbit" id="txtPenerbit" name="Penerbit" readonly="readonly" /></td>
                                                        <td><button type="submit" id="Btn_Search_Kode_Buku" class=" btn btn-warning btn-sm"><i class="fa fa-search"> Cari</i></button></td>
                                                        <td><button type="submit" id="Btn_Add_Search_Kode_Buku" class=" btn btn-success btn-sm"><i class="fa fa-plus"> Add</i></button></td>
                                                    </tr>
                                                </tbody>
                                            </table>
                                        </div>
                                    </div>
                                </div>

                                <div class="col-md-12">
                                    <div class="form-group">
                                        <div align="center">
                                            <input type="submit" value="Save Data Pinjaman" class="btn btn-success" />
                                        </div>
                                    </div>
                                    <div>
                                        <a asp-action="Index"><i class="fa fa-arrow-alt-circle-left"> Back to List</i></a>
                                    </div>
                                </div>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>
<script type="text/javascript" lang="javascript">
    $(document).ready(function () {
        $('#Btn_Add_Search_Kode_Buku').on('click', function () {
            var BukuObj = {
                Kode_Pinjam: $('#txtKode_Pinjam').val(),
                Kode_Buku: $('#txt_Search_Kode_Buku').val(),
                Judul: $('#txtJudul').val(),
                Penulis: $('#txtPenulis').val(),
                Penerbit: $('#txtPenerbit').val()
            }
             $.ajax({
                url: "@Url.Action("SaveData_Search_Buku", "Pinjaman")",
                type: "POST",
                contentType: "application/json;charset=UTF-8",
                dataType: "json",
                data: JSON.stringify(BukuObj),
                success: function () {
                    window.alert('Data berhasil disimpan...');
                 }
             });
        })
    });
</script>
<script type="text/javascript" lang="javascript">
    $(document).ready(function () {
        $('#Btn_Search_Kode_Buku').on("click", function () {
             $.ajax({
                url: "@Url.Action("Get_DataBukuByID", "Pinjaman")",
                type: "GET",
                contentType: "application/json;charset=UTF-8",
                dataType: "json",
                data: { Kode_Buku: $('#txt_Search_Kode_Buku').val() },
                 success: function (data) {
                     if (data !="") {
                         $('#txtJudul').val(data.Judul);
                         $('#txtPenulis').val(data.Penulis);
                         $('#txtPenerbit').val(data.Penerbit);
                     }
                     else {
                         window.alert(' error : ' + data.message);
                     }
                 }
             });
        });
        //return false;
    });
</script>
<script type="text/javascript" lang="javascript">
    $("[id*=Tanggal_Pinjam]").attr("ReadOnly", true)
    $("[id*=Tanggal_Pinjam]").datepicker(
        {
            dateFormat: "yy/mm/dd"
        });

    $("[id*=Tanggal_Kembali]").attr("ReadOnly", true)
    $("[id*=Tanggal_Kembali]").datepicker(
        {
            dateFormat: "yy/mm/dd"
        });
</script>
@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}

Controller.cs

//Method for Save data to database DetailPinjamanBuku 
[HttpPost]
public IActionResult SaveData_Search_Buku()
{
    int i;
    using (SqlConnection con = new SqlConnection(this._configuration.GetConnectionString("db_perpustakaan")))
    {
        using (SqlCommand com = new SqlCommand())
        {
            con.Open();
            com.CommandType = CommandType.Text;
            com.CommandText = "Insert Into Detail_Pinjaman (Kode_Pinjam, Kode_Buku, Judul, Penulis, Penerbit) Values (@Kode_Pinjam, @Kode_Buku, @Judul, @Penulis, @Penerbit)";
            com.Parameters.AddWithValue("@Kode_Pinjam", Request.Form["Kode_Pinjam"].ToString());
            com.Parameters.AddWithValue("@Kode_Buku", Request.Form["Kode_Buku"].ToString());
            com.Parameters.AddWithValue("@Judul", Request.Form["Judul"].ToString());
            com.Parameters.AddWithValue("@Penulis", Request.Form["Penulis"].ToString());
            com.Parameters.AddWithValue("@Penerbit", Request.Form["Penerbit"].ToString());
            i = com.ExecuteNonQuery();
        }
    }
    return Json(i);
}