gridview column datatype

protected void Page_Load(object sender, EventArgs e)
      {
          object[] dataSource = { "Cell 1", 1, 2 };
          GridView1.DataSource = dataSource;
          GridView1.DataBind();
      }

      protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
      {
          if (e.Row.RowType == DataControlRowType.DataRow)
          {
              if (e.Row.DataItem.GetType() == typeof(Int32))
              {
                  TextBox txt = new TextBox();
                  txt.Text = e.Row.Cells[0].Text;
                  e.Row.Cells[0].Text = "";
                  e.Row.Cells[0].BackColor = System.Drawing.Color.Red;
                  e.Row.Cells[0].Controls.Add(txt);
              }
          }
      }