How to filter in dataset any one name is like a name "Raja" in the dataset how to filter?

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Data.OleDb; namespace DataView_RowFilter { public partial class Form1 : Form { string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["dsn"]; OleDbCommand com; OleDbDataAdapter oledbda; DataSet ds; string str; public Form1() { InitializeComponent(); } private void btndisplayall_Click(object sender, EventArgs e) { OleDbConnection con = new OleDbConnection(ConnectionString); con.Open(); str = "select * from student"; com = new OleDbCommand(str, con); oledbda = new OleDbDataAdapter(com); ds = new DataSet(); oledbda.Fill(ds, "student"); dataGridView1.DataSource = ds; dataGridView1.DataMember = "student"; con.Close(); } private void btndisplay_Click(object sender, EventArgs e) { DataTable dt; dt = ds.Tables["student"]; DataView dv = new DataView(dt); dv.RowFilter = "sname='" + textBox1.Text + "'"; dataGridView1.DataSource = dv; } } }