There is no row at position 0.

protected void btnSubmit_Click(object sender, EventArgs e)
    {
        foreach (GridViewRow row in GridView1.Rows)
        {
            if (row.RowType == DataControlRowType.DataRow)
            {
                Label lblOrderId = (Label)row.FindControl("lblOrderId");
                Label Product = (Label)row.FindControl("lblProduct");
                Label ProductID = (Label)row.FindControl("lblProduct_Id");

                Label price = (Label)row.FindControl("lblUPrice");
                DropDownList Quanty = (DropDownList)row.FindControl("myDropDownList");
                Label total = (Label)row.FindControl("lblTotal");
              
                DataSet ds = new DataSet();
                SqlConnection con = new SqlConnection(StrConnection);
                con.Open();
                SqlCommand cmd = new SqlCommand();

                cmd.Parameters.Add("@Order_Id", SqlDbType.Int).Value = "0";
                cmd.Parameters.Add("@Product_Id", SqlDbType.Int).Value = int.Parse("0" + ProductID.Text);
                cmd.Parameters.Add("@Quantity", SqlDbType.NVarChar).Value = Quanty.Text;
                cmd.Parameters.Add("@Total_Price", SqlDbType.NVarChar).Value = total.Text;
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.CommandText = "InsertOrder";
                cmd.Connection = con;

                using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                {
                    da.Fill(ds);
                    con.Close();
                    int KeyId = int.Parse("0" + ds.Tables[0].Rows[0][0].ToString());// i want this id ie order_Id for use to insert in other table but geting error and table contain data from order_id- 111 in database//
                }
                
                con.Close();
            }
        }
    }

Create proc InsertOrder 
@Order_Id int, 
@Product_Id int, 
@Quantity nvarchar(50), 
@Total_Price nvarchar(50) 
AS 
  SET NOCOUNT ON 
  SET XACT_ABORT ON 

  BEGIN TRAN 
  SELECT * FROM dbo.Order_Table WHERE Order_Id = @Order_Id 

  begin 

    INSERT INTO dbo.Order_Table 
    ( 
      Product_Id , 
      Quantity , 
      Total_Price 
    ) 
    SELECT 
      @Product_Id , 
      @Quantity , 
      @Total_Price 

    select top 1 Order_Id from dbo.Order_Table order by 1 desc 
   
    end 
  COMMIT