[Solved] Programmatically Select a GridView Row and HighLight from Code Behind in ASP.Net

Please refer this code

HTML

<form id="form1" runat="server">
<div>
    <asp:TextBox ID="txtSearch" runat="server" />
    <asp:LinkButton Text="Search values" OnClick="SearchText" runat="server"></asp:LinkButton>
    <br />
    <hr />
    <br />
    <asp:GridView ID="GridView1" HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White"
        runat="server" AutoGenerateColumns="false">
        <Columns>
            <asp:BoundField DataField="Id" HeaderText="Id" ItemStyle-Width="30" />
            <asp:BoundField DataField="Name" HeaderText="Name" ItemStyle-Width="150" />
            <asp:BoundField DataField="Country" HeaderText="Country" ItemStyle-Width="150" />
        </Columns>
    </asp:GridView>
</div>
<br />
<asp:Button runat="server" OnClick="GetSelectedRow" Text="Get Selected Row Data" />
<br />
<br />
<asp:Label ID="lblMessage" runat="server" />
</form>

Namespaces

using System.Drawing;
using System.Data;
using System.Text;

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
                new DataColumn("Name", typeof(string)),
                new DataColumn("Country",typeof(string)) });
        dt.Rows.Add(1, "John Hammond", "United States");
        dt.Rows.Add(2, "Mudassar Khan", "India");
        dt.Rows.Add(3, "Suzanne Mathews", "France");
        dt.Rows.Add(4, "Robert Schidner", "Russia");
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
}

protected void SearchText(object sender, EventArgs e)
{
    foreach (GridViewRow row in this.GridView1.Rows)
    {
        if (row.Cells[1].Text == this.txtSearch.Text.Trim())
        {
            GridView1.SelectRow(row.RowIndex);
            row.BackColor = Color.PeachPuff;
        }
    }
}

protected void GetSelectedRow(object sender, EventArgs e)
{
    if (GridView1.SelectedRow != null)
    {
        StringBuilder message = new StringBuilder();
        message.Append("window.onload = function(){ alert('");
        message.Append(string.Format("Id: {0} \\n", GridView1.SelectedRow.Cells[0].Text));
        message.Append(string.Format("Name: {0} \\n", GridView1.SelectedRow.Cells[1].Text));
        message.Append(string.Format("Country: {0}", GridView1.SelectedRow.Cells[2].Text));
        message.Append("');}");
        ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", message.ToString(), true);
    }
}

Screenshot