C# Developement software

<div>
        Enter first name to search:
    </div>
    <div>
        <asp:TextBox ID="txtSearch" runat="server" AutoPostBack="true" OnTextChanged="txtSearch_TextChanged">
        </asp:TextBox>&nbsp;
    </div>
    <div>
        <asp:UpdatePanel ID="updatepanel1" runat="server">
            <ContentTemplate>
                <asp:GridView ID="grdSearch" runat="server" AutoGenerateColumns="false">
                    <Columns>
                        <asp:TemplateField HeaderText="Employee Id">
                            <ItemTemplate>
                                <asp:Label ID="lblFirstName" runat="server" Text='<%# Highlight(Eval("emp_id").ToString()) %>'>
                                </asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Employee First Name">
                            <ItemTemplate>
                                <asp:Label ID="lblLastName" runat="server" Text='<%#(Eval("emp_first_name")) %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Employee Middle Name">
                            <ItemTemplate>
                                <asp:Label ID="lblLocation" runat="server" Text='<%#(Eval("emp_middle_name")) %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Employee Last Name">
                            <ItemTemplate>
                                <asp:Label ID="lblLocation" runat="server" Text='<%#(Eval("emp_last_name")) %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Employee Name">
                            <ItemTemplate>
                                <asp:Label ID="lblLocation" runat="server" Text='<%#(Eval("emp_name")) %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>
            </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="txtSearch" EventName="TextChanged" />
            </Triggers>
        </asp:UpdatePanel>
    </div>

string strConnection = "Data Source=BITPLUS3\\SqlExpress;Initial Catalog=HRDB;User ID=sa;pwd=bit123";

        //ConfigurationManager.AppSettings["WebHRConnectionString"];

    protected void Page_Load(object sender, EventArgs e)
    {

        if (!IsPostBack)
        {
         //   BindGrid();
        }

    }

    private DataTable GetRecords()
    {
        SqlConnection conn = new SqlConnection(strConnection);
        conn.Open();
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = conn;
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "Select emp_id, emp_first_name, emp_middle_name,emp_last_name, emp_name from tblemployee";
 
        SqlDataAdapter dAdapter = new SqlDataAdapter();
        dAdapter.SelectCommand = cmd;
        DataSet objDs = new DataSet();
        dAdapter.Fill(objDs);
        return objDs.Tables[0];

    }
    private void BindGrid()
    {
        DataTable dt = GetRecords();
        if (dt.Rows.Count > 0)
        {
            grdSearch.DataSource = dt;
            grdSearch.DataBind();
        }
    }
    private void SearchText()
    {
        DataTable dt = GetRecords();
        DataView dv = new DataView(dt);
        string SearchExpression = null;
        if (!String.IsNullOrEmpty(txtSearch.Text))
        {
            SearchExpression = string.Format("{0} '%{1}%'",
            grdSearch.SortExpression, txtSearch.Text);

        }
 
        dv.RowFilter = "emp_name like" + SearchExpression;
        grdSearch.DataSource = dv;
        grdSearch.DataBind();

    }
    public string Highlight(string InputTxt)
    {
        string Search_Str = txtSearch.Text.ToString();
        // Setup the regular expression and add the Or operator.
        Regex RegExp = new Regex(Search_Str.Replace(" ", "|").Trim(),
        RegexOptions.IgnoreCase);

        // Highlight keywords by calling the 
        //delegate each time a keyword is found.
        return RegExp.Replace(InputTxt,
        new MatchEvaluator(ReplaceKeyWords));

        // Set the RegExp to null.
        RegExp = null;

    }

    public string ReplaceKeyWords(Match m)
    {

        return "<span class=highlight>" + m.Value + "</span>";

    }

    protected void txtSearch_TextChanged(object sender, EventArgs e)
    {
 
        SearchText();
    }