SharePoint Custom search from C#.net application

using System;

using System.ComponentModel;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using Microsoft.SharePoint;

using Microsoft.SharePoint.WebControls;

using Microsoft.Office.Server;

using Microsoft.Office.Server.Search;

using Microsoft.Office.Server.Search.Query;

using Microsoft.Office.Server.Search.Administration;

using System.Data;

namespace SharePointCustomSearchWP.searchWP

[ToolboxItemAttribute(false)]

public class searchWP : WebPart

protected Button btnSearch;

protected TextBox txtSearchBox;

protected Label lblResults;

protected GridView gridSearchResults;

protected override void CreateChildControls()

txtSearchBox = new TextBox();

this.Controls.Add(txtSearchBox);

lblResults = new Label();

this.Controls.Add(lblResults);

btnSearch = new Button();

btnSearch.Text = "Find";

btnSearch.Click += new EventHandler(btnSearch_Click);

this.Controls.Add(btnSearch);

void btnSearch_Click(object sender, EventArgs e)

if (string.IsNullOrEmpty(txtSearchBox.Text))

lblResults.Text = "Please enter words to search for";

return;

void ExecuteKeywordQuery(string keywordQueryText)

//Get a proxy for Search Service Application(SSA). The SSA serves search queries.

SearchServiceApplicationProxy SSAProxy = (SearchServiceApplicationProxy)SearchServiceApplicationProxy.GetProxy(SPServiceContext.GetContext(SPContext.Current.Site));

KeywordQuery keywordQuery = new KeywordQuery(SSAProxy);

//keyword search using default provider. We can use "FAST" or "SharepointSearch" to be specific.

keywordQuery.ResultsProvider = SearchProvider.Default;

keywordQuery.ResultTypes |= ResultType.RelevantResults;

ResultTableCollection searchResults = keywordQuery.Execute();

if (searchResults.Exists(ResultType.RelevantResults))

ResultTable searchResult = searchResults[ResultType.RelevantResults];

DataTable result = new DataTable();

result.TableName = "SearchResults";

result.Load(searchResult, LoadOption.OverwriteChanges);

private void PopulateResultsGrid(DataTable resultsTable)

gridSearchResults = new GridView();

protected override void Render(HtmlTextWriter writer)

writer.Write("