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private void button2_Click(object sender, EventArgs e)
  {
  if (textBox4.Text == "")
  {
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  string txt1 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Student1.mdb";
  string txt2 ="selcet * from Student where SutdentName='"+textBox4.Text+"'";
  OleDbConnection conn = new OleDbConnection(txt1);
  conn.Open();
  DataTable dt = new DataTable();
  OleDbDataAdapter dar=new OleDbDataAdapter(txt2,conn);
  dar.Fill(dt);
  dataGridView1.DataSource = dt.DefaultView;

  }
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