How to split the dynamically generated textboxes in two columns

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ASP

.NET

protected void Button1_Click(object sender, EventArgs e)
{





if (txtQuantity.Text != "")
{
for (int i =0; i < Convert.ToInt16(txtQuantity.Text);i++ )
{


Label la = new Label();
la.Text = ddlProductName.SelectedItem.Value + i.ToString();
la.ID = "abc" +i;

PlaceHolder1.Controls.Add(la);

//la = FindControl(String.Format(i)) as Label;




TextBox txtbox = new TextBox();
// txtbox.Text = "Textbox - " + i.ToString();


PlaceHolder1.Controls.Add(new LiteralControl("<input id='txt' name='Textbox" + i + "'type='text' />"));
PlaceHolder1.Controls.Add(new LiteralControl("
"));

}
}


}
Hi Everyone,
This is my code. How will i split the dynamically generated textboxes in gridview into two columns.