Bulk Insert Data from GridView Rows into Database in ASP.Net

HTML:

<form id="form1" runat="server">
    <div>
        Enter Name Please
        <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="refName" runat="server" ForeColor="Red" ControlToValidate="txtName"
            ErrorMessage="Required"></asp:RequiredFieldValidator>
        <br />
        Enter Salary Please<asp:TextBox ID="txtSalary" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ForeColor="Red"
            ControlToValidate="txtSalary" ErrorMessage="Required"></asp:RequiredFieldValidator>
        <asp:Button ID="btnAddInGrid" runat="server" OnClick="AddInGrid" Text="Add In GridView" />
        <br />
        <asp:GridView ID="gvGridview1" runat="server" Width="400" AutoGenerateColumns="false">
            <Columns>
                <asp:BoundField DataField="Name" HeaderText="Name" />
                <asp:BoundField DataField="Salary" HeaderText="Salary" />
            </Columns>
        </asp:GridView>
        <asp:Label ID="lblMessage" runat="server" ForeColor="Red" Text="Please enter some value in gridview"
            Visible="false" /><br />
        <asp:Button Text="Add Grid Data Into Database" CausesValidation="false" OnClick="SaveToDatabase" runat="server" />
    </div>
    </form>

C#:

private DataTable TempTabel
    {
        get
        {
            DataTable dt = new DataTable();
            if (ViewState["CurrentTabele"] == null)
            {
                dt.Columns.AddRange(new DataColumn[2]{new DataColumn("Name",typeof(string)),
                                            new DataColumn("Salary",typeof(int))});
                ViewState["CurrentTabele"] = dt;
            }
            return (DataTable)ViewState["CurrentTabele"];
        }
        set
        {
            ViewState["CurrentTabele"] = value;
        }
    }    

    protected void AddInGrid(object sender, EventArgs e)
    {
        this.lblMessage.Visible = false;
        DataTable dtCurrentTable = TempTabel;
        if (TempTabel != null)
        {
            dtCurrentTable.Rows.Add(txtName.Text, Convert.ToInt32(txtSalary.Text));
            this.gvGridview1.DataSource = dtCurrentTable;
            this.gvGridview1.DataBind();
        }
        TempTabel = dtCurrentTable;
    }

    protected void SaveToDatabase(object sender, EventArgs e)
    {
        if (TempTabel.Rows.Count <= 0)
        {
            this.lblMessage.Visible = true;
        }
        else
        {            
            foreach (GridViewRow row in gvGridview1.Rows)
            {
                string name = row.Cells[0].Text;
                int salary = int.Parse(row.Cells[1].Text);
                this.Save(name, salary);
            }
        }
    }

    private void Save(string name, int salary)
    {
        string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (SqlConnection con = new SqlConnection(conString))
        {
            using (SqlCommand cmd = new SqlCommand("Insert Into Person(name,salary) values(@Name,@Salary)", con))
            {
                con.Open();
                cmd.Parameters.AddWithValue("@Name", name);
                cmd.Parameters.AddWithValue("@Salary", salary);
                cmd.ExecuteNonQuery();
                con.Close();
            }
        }
    }