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Gridview Search word with highlight using c#

Posted By:Lalij Mer       Posted Date: May 14, 2010    Points: 10    Category: DataGrid    URL: http://www.dotnetspark.com  

Search any word or string from gridview with highlight.

  • -> Create a Gridview with TemplateFields for the fields for search.
  • -> Create a datasource with a FilterExpression.
  • -> Add a Search Box.
  • -> at last add the CSS class for highlighting.
using System.Text.RegularExpressions;

partial class GridviewwithHighlightedSearch : System.Web.UI.Page

	// Create a String to store our search results

	string SearchString = "";
	public string HighlightText(string InputTxt)
		// This function is called whenever text is displayed in the FirstName and LastName 
		// fields from our database. If we're not searching then just return the original 
		// input, this speeds things up a bit
		if (string.IsNullOrEmpty(SearchString)) {
			return InputTxt;
		} else {
			// Otherwise create a new regular expression and evaluate the FirstName and 
			// LastName fields against our search string.
			Regex ResultStr = default(Regex);
			ResultStr = new Regex(SearchString.Replace(" ", "|"), RegexOptions.IgnoreCase);
			return ResultStr.Replace(InputTxt, new MatchEvaluator(ReplaceWords));

	public string ReplaceWords(Match m)
		// This match evaluator returns the found string and adds it a CSS class I defined 
		// as 'highlight'
		return "" + m.ToString + "";

	protected void btnClear_Click(object sender, System.Web.UI.ImageClickEventArgs e)
		// Simple clean up text to return the Gridview to it's default state
		txtSearch.Text = "";
		SearchString = "";

	protected void btnSearch_Click(object sender, System.Web.UI.ImageClickEventArgs e)
		// Set the value of the SearchString so it gets 
		SearchString = txtSearch.Text;


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