Creating a Basic Search Web Part Using the Query Object Model

//Namespace to use for search

using System.Data;
using Microsoft.Office.Server.Search.Query;
using Microsoft.Office.Server.Search.Administration;

// inside create child of your web part pub this code

protected override void CreateChildControls()
{
     Controls.Clear();
     queryTextBox = new TextBox();
     this.Controls.Add(queryTextBox);
     queryButton = new Button();
     queryButton.Text = "Start Search";
     queryButton.Click += new EventHandler(queryButton_Click);
     this.Controls.Add(queryButton);
     resultsLabel = new Label();
     this.Controls.Add(resultsLabel);
}

//button click method which will call the function to execute

void queryButton_Click(object sender, EventArgs e)
{
     if (queryTextBox.Text != string.Empty)
     {
          ExecuteKeywordQuery(queryTextBox.Text);
     }
     else
     {
          resultsLabel.Text = "You must enter a search word.";
     }
}

//method to execute the query and fetch the results

void ExecuteKeywordQuery(string queryText)
{
     SearchServiceApplicationProxy proxy = (SearchServiceApplicationProxy)SearchServiceApplicationProxy.GetProxy
(SPServiceContext.GetContext(SPContext.Current.Site));
     KeywordQuery query = new KeywordQuery(proxy);
     query.ResultsProvider = Microsoft.Office.Server.Search.Query.SearchProvider.Default;
     query.QueryText = queryText;
     query.ResultTypes|=ResultType.RelevantResults;
     ResultTableCollection searchResults = query.Execute();

     if(searchResults.Exists(ResultType.RelevantResults))
     {
          ResultTable searchResult = searchResults[ResultType.RelevantResults];
          DataTable result = new DataTable();
          result.TableName = "Result";
          result.Load(searchResult,LoadOption.OverwriteChanges);
          FillResultsGrid(result);
     }
}

//generate and display the results in grid view

private void FillResultsGrid(DataTable resultTable)
{
     //Instantiate the DataGrid
     resultsGrid = new DataGrid();
     //Set the DataSource
     resultsGrid.DataSource = resultTable;
     //Bind the data to the DataGrid
     resultsGrid.DataBind();
     //Add the DataGrid to the controls
     Controls.Add(resultsGrid);
}