<table class="newCustButton" width="100%" cellpadding="10" cellspacing="10" border="1">
                    <tr>
                        <td align="center" width="48%">
                            <asp:Image ID="image01" runat="server" Width="100%" Height="300" onError="this.onerror=null;this.src='/resource/altImage.png';"/>
                            <div align="right">
                                <asp:FileUpload ID="image01_update" runat="server" onchange="showPreview(this);" style="float:left;"/>
                                <asp:Button ID="image01_approve" runat="server" Class="btn btn-danger btn-default-color btn-sm" Text="Approve" CausesValidation="true" ValidationGroup="DetailsGroup" CommandArgument="img_01" OnCommand="btnApprovePropertyImage_Click" />
                                <asp:Button ID="image01_disapprove" runat="server" Class="btn btn-danger btn-default-color btn-sm" Text="Disapprove" CausesValidation="true" ValidationGroup="DetailsGroup" CommandArgument="img_01" OnCommand="btnDisApprovePropertyImage_Click" />
                                <asp:Button ID="image01_delete" runat="server" Class="btn btn-danger btn-default-color btn-sm" Text="Delete" CausesValidation="true" ValidationGroup="DetailsGroup" CommandArgument="img_01" OnCommand="btnDeletePropertyImage_Click" />
                            </div>
                        </td>

                        <td width="4%"></td>

                        <td align="center" width="48%">
                            <asp:Image ID="image02" runat="server" Width="100%" Height="300" onError="this.onerror=null;this.src='/resource/altImage.png';"/>
                            <div align="right">
                                <asp:FileUpload ID="image02_update" runat="server" onchange="showPreview(this);" style="float:left;" />
                                <asp:Button ID="image02_approve" runat="server" Class="btn btn-danger btn-default-color btn-sm" Text="Approve" CausesValidation="true" ValidationGroup="DetailsGroup" CommandArgument="img_02" OnCommand="btnApprovePropertyImage_Click" />
                                <asp:Button ID="image02_disapprove" runat="server" Class="btn btn-danger btn-default-color btn-sm" Text="Disapprove" CausesValidation="true" ValidationGroup="DetailsGroup" CommandArgument="img_02" OnCommand="btnDisApprovePropertyImage_Click" />
                                <asp:Button ID="image02_delete" runat="server" Class="btn btn-danger btn-default-color btn-sm" Text="Delete" CausesValidation="true" ValidationGroup="DetailsGroup" CommandArgument="img_02" OnCommand="btnDeletePropertyImage_Click" />
                            </div>
                        </td>
                    </tr>

<tr> another two image uploaders are here with same code but with different ID's</tr>

function showPreview(input) {
        if (input.files && input.files[0]) {
            var reader = new FileReader();
            reader.onload = function (e) {
                $(input).prev().css('visibility', 'visible');
                $(input).prev().attr('src', e.target.result);
            }
            reader.readAsDataURL(input.files[0]);
        }
    }