Create DataTable and store data in datatable and bind with gridview

Create DataTable:

 private void temptable()

        {

            DataTable dt = new DataTable();

            dt.Columns.Add("ItemDetail_ID", typeof(int));

            dt.Columns.Add("Item_Price", typeof(string));

            dt.Columns.Add("Item_Barcode", typeof(string));

            dt.Columns.Add("Quantity", typeof(string));

            dt.Columns.Add("image", typeof(string));

            Session["dt"] = dt;

            BindGrid();

        }

Bind DataTable with GridView:

   protected void BindGrid()

        {

            gvattributes.DataSource = Session["dt"] as DataTable;

            gvattributes.DataBind();

        }

Enter Data in DataTable:

protected void btnSave_Click(object sender, EventArgs e)

{

DataTable dt=Session["dt"] as DataTable;

  dr = dt.NewRow();

                    dr["ItemDetail_ID"]= txtItemDetail_ID.Text.ToString();

                    dr["Item_Price"] = txtItem_Price.Text;

                    dr["Item_Barcode"] = txtItem_BarCode.Text;

                    dr["Quantity"] = txtQuantity.Text;

                    dr["image"] = txtItemDetail_ID.Text.ToString();

 Session["dt"] = dt;

BindGrid();

}