How to add next and previous button for data grid view using C# win forms

I am use this below code, i am click a button all records are display in my data grid view,

SqlConnection con=new SqlConnection(db.Connectionstring());
DataSet ds = new DataSet();
try
{
con.Open();
SqlCommand cmd = new SqlCommand("SELECT * FROM sales where cstname='"+txtFind.Text+"'", con);
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
da.Fill(ds);
dataGridView1.DataSource = ds.Tables[0];

dataGridView1.DataMember = "sales";

}
catch (Exception ex)
{
//Exception Message
}
finally
{
con.Close();
con.Dispose();
}


how to solve this problem.