how to get textbox value in gridview in window application

dataGrivView1[0,0].Value = txtbox1.Text;

	DataRow rd;
rd[0]=txtbox1.text;
and declare a data table
datatable dt=new datatable;
dt.rows .add(rd);
dataGridView.Datasource=dt;

DataGridViewRow row = new DataGridViewRow();
 	  
 	row.CreateCells(this.dataGridView1, textBox1.Text, textBox2.Text, textBox3.Text);
 	   
 	this.dataGridView1.Rows.Add(row);