adding new row everytime to datatable in gridview

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ASP.NET

Hello sir,

I am entering some data to gridview with 5 textboxes by submit button. For this I created a datatable and I added those columns and rows. But whenever I am entering in second row, it is overriding the first row and not displaying two rows.
My requirement is that I want to enter 100 rows and display them in gridview. To do this what do I do? If anybody knows, please help me. Somebody please give me a proper solution.
How can I write a for loop to create new row every time.
My code is below.
Thank you.

public partial class PurchaseOrder1 : System.Web.UI.Page
{
    DataTable dt = new DataTable();
    protected void GVProductOrderBind()
    {
        GVProductOrder.DataSource = dt;
        GVProductOrder.DataBind();
        Session["GVTable"] = dt;
        
    }
    protected void InsertToGrid()
    {
        DataRow drNew = dt.NewRow();
        drNew["ItemCode"] = TxtItemCode.Text;
        drNew["ItemName"] = TxtItemDescription.Text;
        drNew["EanCode"] = TxtEanCode.Text;
        drNew["Cost"] = TxtCP.Text;
        drNew["MRP"] = TxtMRP.Text;
        drNew["SP"] = TxtSP.Text;
        drNew["MBQ"] = TxtACP.Text;
        drNew["Quantity"] = TxtQty.Text;
        drNew["FreeQty"] = TxtFreeQty.Text;
        drNew["FixedDisc"] = TxtDiscPercentage.Text;
        drNew["Tax"] = TxtTaxPercentage.Text;
        drNew["Value"] = TxtValue.Text;
        drNew["OnOrder"] = TxtOnOrder.Text;
        drNew["Remarks"] = TxtQOH.Text;
        drNew["Type"] = TxtUOP.Text;
        dt.Rows.Add(drNew);
        GVProductOrderBind();
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
              //dt.Columns.Add("ItemCode", System.Type.GetType("System.String"));
                DataRow dr = dt.NewRow();
                dt.Columns.Add("ItemCode");
                dt.Columns.Add("ItemName");
                dt.Columns.Add("EanCode");
                dt.Columns.Add("Cost");
                dt.Columns.Add("MRP");
                dt.Columns.Add("SP");
                dt.Columns.Add("MBQ");
                dt.Columns.Add("Quantity");
                dt.Columns.Add("FreeQty");
                dt.Columns.Add("FixedDisc");
                dt.Columns.Add("Tax");
                dt.Columns.Add("Value");
                dt.Columns.Add("OnOrder");
                dt.Columns.Add("Remarks");
                dt.Columns.Add("Type");

                dt.Rows.Add(dr);
                GVProductOrderBind();
           
        }
        catch (Exception ex)
        {
            throw ex;
        }       
       
    }
    protected void BtnClose_Click(object sender, EventArgs e)
    {
        Response .Redirect ("~/Welcome.aspx");
    }
    protected void BtnSave_Click(object sender, EventArgs e)
    {
        try
        {       
          DataTable dt = (DataTable)Session["GVTable"];
          InsertToGrid();
        }
        catch (Exception ex)
        {
          throw ex;
        }
    }
}