Use textbox in gridview bound field in asp.net

I have a gridview which I used to display tabular data. I want the users to edit the field values and save it. Is there any way to add a textbox in place of bound field. This is my gridview.

   <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
Height="186px" Width="325px">
          <Columns>       
          </Columns>
  </asp:GridView>

This is the code behind which populate the GridView

    public List<DataControlField> columns = new List<DataControlField>();
    public object DataSource { get; set; }

    protected void Page_Init(object sender, EventArgs e)
    {
        for (int i = 0; i < 10; i++)
        {
            BoundField bf = new BoundField() ; 
            bf.HeaderText = "LastName"  ; 
            bf.DataField = "LastName";

            columns.Add(bf);
        }

        foreach (DataControlField col in columns)
        {
            GridView1.Columns.Add(col);
        } 


    }
    protected void Page_Load(object sender, EventArgs e)
    {
        List<Data> lastN = new List<Data>() ; 
        for(int i = 0 ; i < 50; i++ )
        {
            lastN.Add(new Data(i.ToString())); 
        }
        GridView1.DataSource = lastN;
        GridView1.DataBind();
    }
}