How to filter data in datagridview C#

void BtnShowDataClick(object sender, EventArgs e)
		{
			//display data
			DataTable d1 = new DataTable();
			//add column header
			d1.Columns.Add("id");
			d1.Columns.Add("name");
			d1.Columns.Add("qty");
			d1.Columns.Add("price");
			d1.Columns.Add("product_group");
			//add mockup data
			d1.Rows.Add(new object[] {001,"pd1",50,100,"group1"});
			d1.Rows.Add(new object[] {002,"pd2",150,200,"group1"});
			d1.Rows.Add(new object[] {003,"pd3",250,300,"group2"});
			d1.Rows.Add(new object[] {004,"pd4",200,400,"group2"});
			d1.Rows.Add(new object[] {005,"pd5",300,500,"group3"});
		    d1.Rows.Add(new object[] {006,"pd6",95,600,"group3"});
		    
		    dataGridView1.DataSource = d1;
		    
		}