How to insert a label string value as a float value

protected void btn_add_Click(object sender, EventArgs e)

{

try

{

// availability();

con.Open();

SqlCommand cmd = new SqlCommand("insert into AddToDiary_tb (U_EmailAddress,Food_Name,Date,Meal_time,Serving_Size,Calories,Fat,Protien,Carbohydrates,Cholesterol) values(@U_EmailAddress,@Food_Name,@Date,@Meal_time,@Serving_Size,@Calories,@Fat,@Protien,@Carbohydrates,@Cholesterol)", con);

cmd.Parameters.AddWithValue("@U_EmailAddress", lbl_userNameDisplay.Text);

cmd.Parameters.AddWithValue("@Food_Name", lbl_FoodName.Text);

cmd.Parameters.AddWithValue("@Date", DateTime.Today.ToString());

cmd.Parameters.AddWithValue("@Meal_time", RadioButtonList1.SelectedValue);

cmd.Parameters.AddWithValue("@Serving_Size",lbl_Size.Text);

cmd.Parameters.AddWithValue("@Calories",float.Parse(lbl_Calorie.Text.Trim(), CultureInfo.InvariantCulture.NumberFormat));

cmd.Parameters.AddWithValue("@Fat", float.Parse(lbl_fat.Text.Trim(), CultureInfo.InvariantCulture.NumberFormat));

cmd.Parameters.AddWithValue("@Protien", float.Parse(lbl_Protien.Text.Trim(), CultureInfo.InvariantCulture.NumberFormat));

cmd.Parameters.AddWithValue("@Carbohydrates", float.Parse(lbl_Carbohydrates.Text.Trim(), CultureInfo.InvariantCulture.NumberFormat));

cmd.Parameters.AddWithValue("@Cholesterol", float.Parse(lbl_Cholesterol.Text.Trim(), CultureInfo.InvariantCulture.NumberFormat));

SqlDataAdapter da = new SqlDataAdapter(cmd);

cmd.ExecuteNonQuery();

Page.ClientScript.RegisterStartupScript(this.GetType(), "Script", "");

clear();

GridView1.DataBind();

}

catch (Exception ex)

{

Response.Write(ex);

Page.ClientScript.RegisterStartupScript(this.GetType(), "Script", "");

}

finally

{

}

}