[Solved] Request.Form.GetValues Error: Object reference not set to an instance of an object in ASP.Net Master page

Hi rakeshkuma,

Check this example. Now please take its reference and correct your code.

HTML

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" />
    <script type="text/javascript">
        function addRow(tableID) {
            var table = document.getElementById(tableID);
            var rowCount = table.rows.length;
            var row = table.insertRow(rowCount);
            var colCount = table.rows[0].cells.length;
            for (var i = 0; i < colCount; i++) {
                var newcell = row.insertCell(i);
                newcell.innerHTML = table.rows[0].cells[i].innerHTML;
                switch (newcell.childNodes[0].type) {
                    case "text":
                        newcell.childNodes[0].value = "";
                        break;
                    case "checkbox":
                        newcell.childNodes[0].checked = false;
                        break;
                    case "select-one":
                        newcell.childNodes[0].selectedIndex = 0;
                        break;
                }
            }
        }

        function deleteRow(tableID) {
            try {
                var table = document.getElementById(tableID);
                var rowCount = table.rows.length;

                for (var i = 0; i < rowCount; i++) {
                    var row = table.rows[i];
                    var chkbox = row.cells[0].childNodes[1];
                    if (chkbox != null && chkbox.checked == true) {
                        if (rowCount <= 1) {
                            alert("Cannot delete all the rows.");
                            break;
                        }
                        table.deleteRow(i);
                        rowCount--;
                        i--;
                    }
                }
            } catch (e) {
                alert(e);
            }
        }
    </script>
    <form id="form1" runat="server" enctype="multipart/form-data" method="post">
        <section class="container-fluid block location-block">
            <div class="container">
                <div class="row">
                    <div class="card card-body" style="margin-top: -20px">
                        <div class="row">
                            <div class="col-sm-3">
                                <table id="dataTable1" class="table-bordered table-hover table-striped table">
                                    <tr>
                                        <td>
                                            <input type="checkbox" name="chk" />
                                        </td>
                                        <td>
                                            <asp:TextBox ID="item" runat="server"></asp:TextBox>
                                        </td>
                                        <td>
                                            <asp:TextBox ID="dsca" runat="server"></asp:TextBox>
                                        </td>
                                    </tr>
                                </table>
                            </div>
                        </div>
                        <div class="row">
                            <div class="col-sm-3">
                                <input type="button" class="btn btn-primary btn-xs" value="ADD" onclick="addRow('dataTable1')" />
                                <input type="button" class="btn btn-primary btn-xs" value="DELETE" onclick="deleteRow('dataTable1')" />
                                <asp:Button ID="btnsubmit" runat="server" Text="SUBMIT" CssClass="btn btn-primary btn-xs" OnClick="btnsubmit_Click" />
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </section>
    </form>
</asp:Content>

Namespaces

C#

using System.Configuration;
using System.Data.SqlClient;

VB.Net

Imports System.Configuration
Imports System.Data.SqlClient

Code

C#

protected void btnsubmit_Click(object sender, EventArgs e)
{
    string[] item = Request.Form.GetValues(this.item.UniqueID);
    string[] dsca = Request.Form.GetValues(this.dsca.UniqueID);
    int len = 0;
    if (item.Length > len)
    {
        len = item.Length;
    }
    if (dsca.Length > len)
    {
        len = dsca.Length;
    }

    for (int i = 0; i <= len - 1; i++)
    {
        string constr = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;
        SqlConnection con = new SqlConnection(constr);
        SqlCommand cmd = new SqlCommand("INSERT INTO rak_tblitem(item,dsca)values(@item,@dsca)", con);
        cmd.Parameters.AddWithValue("@item", item[i]);
        cmd.Parameters.AddWithValue("@dsca", dsca[i]);
        con.Open();
        cmd.ExecuteNonQuery();
        con.Close();
    }
}

VB.Net

Protected Sub btnsubmit_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim item As String() = Request.Form.GetValues(Me.item.UniqueID)
    Dim dsca As String() = Request.Form.GetValues(Me.dsca.UniqueID)
    Dim len As Integer = 0
    If item.Length > len Then
        len = item.Length
    End If
    If dsca.Length > len Then
        len = dsca.Length
    End If
    For i As Integer = 0 To len - 1
        Dim constr As String = ConfigurationManager.ConnectionStrings("conString").ConnectionString
        Dim con As SqlConnection = New SqlConnection(constr)
        Dim cmd As SqlCommand = New SqlCommand("INSERT INTO rak_tblitem(item,dsca)values(@item,@dsca)", con)
        cmd.Parameters.AddWithValue("@item", item(i))
        cmd.Parameters.AddWithValue("@dsca", dsca(i))
        con.Open()
        cmd.ExecuteNonQuery()
        con.Close()
    Next
End Sub