NopCommerce search error:Input string was not in a correct format

@model SearchModel
@{
    Layout = "~/Views/Shared/_ColumnsThree.cshtml";
    Html.AddTitleParts(T("PageTitle.Search").Text);
}
@using Nop.Core;
@using Nop.Core.Infrastructure;
@using Nop.Web;
@using Nop.Web.Models.Catalog;
@using Nop.Web.Extensions;
<script type="text/javascript">
    $(document).ready(function () {
        $("#@Html.FieldIdFor(model => model.As)").click(toggleAdvancedSearch);
        toggleAdvancedSearch();
    });
    function toggleAdvancedSearch() {
        if (getE('@Html.FieldIdFor(model => model.As)').checked) {
            $('#pnl-advanced-search').show();
            $('#pnl-advanced-search2').hide();
        }
        else {
            $('#pnl-advanced-search').hide();
            $('#pnl-advanced-search2').show();
        }
    }
</script>
<div class="search-panel">
@using (Html.BeginRouteForm("ProductSearch", FormMethod.Get))
{
    <div class="search-input">
        <table class="basic-search">
            <tbody>
                <tr>
                    <td style="border:0px solid yellow; width:100px;">
                        @Html.LabelFor(model => model.Q):
                    </td>
                    <td style="border:0px solid blue;">
                        @Html.TextBoxFor(model => model.Q, new { @class = "searchtext" })
                    </td>
                    <!-- :IAN:S-but: -->
                    <td style="border:0px solid red;width:50px;">
                        <input type="submit" id="btnsearch" name="btnsearch" class="Button3" value="@T("Search")" />
                    </td>
                    <!-- :IAN:S-Adv: -->
                    <td style="border:0px solid green;width:120px;">
                        &nbsp;&nbsp;
                        @Html.CheckBoxFor(model => model.As)
                        @Html.LabelFor(model => model.As)
                    </td>
                </tr>
               
                <tr>
                    <td colspan="2">
                        <table class="adv-search" id="pnl-advanced-search">
                            <tbody>
                                @if (Model.AvailableCategories.Count > 0)
                                {
                                    <tr>
                                        <td class="title">
                                            @Html.LabelFor(model => model.Cid):
                                        </td>
                                        <td class="data">
                                            @Html.DropDownListFor(model => model.Cid, Model.AvailableCategories)
                                        </td>
                                    </tr>
                                }
                                @if (Model.AvailableManufacturers.Count > 0)
                                {
                                    <tr>
                                        <td class="title">
                                            @Html.LabelFor(model => model.Mid):
                                        </td>
                                        <td class="data">
                                            @Html.DropDownListFor(model => model.Mid, Model.AvailableManufacturers)
                                        </td>
                                    </tr>
                                }
                                <tr>
                                    <td class="title">
                                        @T("Search.PriceRange"):
                                    </td>
                                    <td class="data">
                                        @T("Search.PriceRange.From")
                                        @Html.TextBoxFor(model => model.Pf, new { style = "width: 100px" })
                                        @T("Search.PriceRange.To")
                                        @Html.TextBoxFor(model => model.Pt, new { style = "width: 100px" })
                                    </td>
                                </tr>
                                <tr>
                                    <td class="data" colspan="2">
                                        @Html.CheckBoxFor(model => model.Sid)
                                        @Html.LabelFor(model => model.Sid)
                                    </td>
                                </tr>
                            </tbody>
                        </table>
            @*<div id="pnl-advanced-search2">*@                              
            @*{ViewContext.Writer.Write("<br/>");}
            @{ViewContext.Writer.Write("<br/>");}*@
            @*</div>*@  
                    </td>
                </tr>
                <tr>
                @if (!String.IsNullOrEmpty(Model.Warning))
                {
                        <td colspan="2">
                            <span class="warning">
                                @Model.Warning
                            </span>
                        </td>
                }
                </tr>
            </tbody>
        </table>
    </div> 
    <div class="search-results">
        @if (Model.NoResults)
        {
            <div style="padding-left:13px;padding-top:25px;">
            <span class="result">
                <b>NO SEARCH RESULTS FOUND</b>
                <p>We're sorry, no products were found for your search: <span style=" color:Maroon;"><b>@Model.Q</b></span></p>
                <b>TRY YOUR SEACH AGAIN USING THESE TIPS:</b>
                <p>
                    <ul>
                        <li>Double check the spelling. Try varying the spelling</li>
                        <li>Limit the search to one or two words</li>
                        <li>Try a new search</li>
                    </ul>
                </p>
                <p><b>Alternatively click on one of our product groups:<br />
                <span style=" color:Maroon;">or call us on 01844 220 500</span></b></p>
                <div style="padding-left:50px;">
                @foreach (var category in Model.AvailableCategories.Where(c => !c.Text.Contains(">>") && c.Text != "All"))
                {
                    <a href="@Url.RouteUrl("Category", new { categoryId = category.Value, SeName = category.Text.Replace("&", "-").Replace(",", "-").Replace(":", "-").Replace(" ", "-").Replace("/", "-") })">@category.Text</a>
                    <br />             
                }
                </div>
            </span>
            </div>
        }
        else
        {     
            <!-- product-list -->              
            <div class="">        
					@*foreach (var product in Model.Products.Where(p => p.Name.ToLower().Contains(Model.Q.ToLower())))*@
                    @foreach (var product in Model.Products.Where(p => p.AdminComment.ToLower().Contains(Model.Q.ToLower())))
                    {   
                       @Html.Partial("_SearchResultProductBox", product)        
                    }
            @{ViewContext.Writer.Write("<table style='position: relative; top:0px; width:699px; height:auto; left:-15px; background-color: White; border:0px solid silver; color: Blue;'>");}
            @{ViewContext.Writer.Write("<tr>");}
            @{ViewContext.Writer.Write("<td>");}
            Your search term <span style=" color:Maroon;"><b>@Model.Q</b></span> appears in several of our categories.<br />
            Alternatively click on one of our product groups below:<br />
            <span style=" color:Maroon;"><b>or call us on 01844 220 500</b></span>
            @{ViewContext.Writer.Write("</td>");}
            @{ViewContext.Writer.Write("</tr>");}
            @{ViewContext.Writer.Write("<tr>");}
            @{
              int nCount = 0;
              foreach (var category in Model.AvailableCategories)
              {
                  if (nCount == 2)
                  {
                      nCount = 0;
                      ViewContext.Writer.Write("</tr>");
                      ViewContext.Writer.Write("<tr>");
                  }
                  ViewContext.Writer.Write("<td>");
                    <a href="@Url.RouteUrl("Category", new { categoryId = category.Value, SeName = category.Text.Replace(":", "-").Replace(" ", "-").Replace("/", "-") })">@category.Text</a>
                  ViewContext.Writer.Write("</td>");
                  nCount = nCount + 1;
              }
            }
            @{ViewContext.Writer.Write("</tr>");}
            @{ViewContext.Writer.Write("</table>");}	
            </div>        
            <div class="clear">
            </div>
            <div class="pager" style="padding-top:10px;">
                @Html.Pager(Model.PagingFilteringContext).QueryParam("pagenumber").BooleanParameterName("as").BooleanParameterName("sid")
            </div>         
        }
    </div>
}
</div>

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