Iam new to c# create sample form but iam getting where i made a mistake if any one please help me.
 using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
namespace WebApplication7
{
    public partial class task1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        }
        protected void subbtn_Click(object sender, EventArgs e)
        {
           // lblresult.Text=fnametxt.Text+ " " +lnametxt.Text+ " " +yeardropdown.SelectedItem.Text+ " " +monthdropdown.SelectedItem.Text+ " " +daydropdown.SelectedItem.Text+ " " +quadropdown.SelectedItem.Text+ " " +CheckBox1.Text+ " " ;
            
            assingValues();
             sqlconnection con=new sqlconnection("Data Source=MURALI\SQLEXPRESS;Initial Catalog=test;Integrated Security=True");
             sqlcommand cmd=new sqlcommand("Insert into sampleform(FName,LName,Gender,Year,Month,Day,Qualification,check)values(@FName,@LName,@Gender,@Year,@Month,@Day,@Qualification,@check)");   
                
                    con.Open();
             cmd.CommandType = CommandType.Text;
    cmd.Parameters.AddWithValue("@FName", fnametxt.Text);
    cmd.Parameters.AddWithValue("@LName", lnametxt.Text);
    cmd.Parameters.AddWithValue("@Gender", radioGeder.SelectedItem.Text);
    cmd.Parameters.AddWithValue("@Year", yeardropdown.SelectedItem.Text);
    cmd.Parameters.AddWithValue("@Month", monthdropdown.SelectedItem.Text);
    cmd.Parameters.AddWithValue("@Day", daydropdown.SelectedItem.Text);
            cmd.Parameters.AddWithValue("@Qualification", quadropdown.SelectedItem.Text);
    cmd.Parameters.AddWithValue("@check", monthdropdown.SelectedItem.Text);
    cmd.Parameters.AddWithValue("@Day", check.Checked);
               // cmd.Parameters.Add("FName", SqlDbType.VarChar);
                //cmd.Parameters["FName"].Value = fnametxt.Text;
                //cmd.Parameters.Add("LName", SqlDbType.VarChar);
                //cmd.Parameters["LName"].Value = lnametxt.Text;
                //cmd.Parameters.Add("Gender", SqlDbType.VarChar);
                //cmd.Parameters["Gender"].Value = radioGeder.SelectedItem.Text;
                //cmd.Parameters.Add("Year", SqlDbType.Int);
                //cmd.Parameters["Year"].Value = yeardropdown.SelectedItem.Text;
                //cmd.Parameters.Add("Month", SqlDbType.Int);
                //cmd.Parameters["Month"].Value = monthdropdown.SelectedItem.Text;
                //cmd.Parameters.Add("Day", SqlDbType.Int);
                //cmd.Parameters["Day"].Value = daydropdown.SelectedItem.Text;
                //cmd.Parameters.Add("Qualification", SqlDbType.VarChar);
                //cmd.Parameters["Qualification"].Value = quadropdown.SelectedItem.Text;
                //cmd.Parameters.Add("check", SqlDbType.VarChar);
                //cmd.Parameters["check"].Value = check.Checked;
            
        cmd.ExecuteNonQuery();
        con.Close();
        
        }
    
        protected void clearbtn_Click(object sender, EventArgs e)
        {
            fnametxt.Text = "";
            lnametxt.Text = "";
            yeardropdown.SelectedItem.Text = "Year";
            monthdropdown.SelectedItem.Text = "Month";
            daydropdown.SelectedItem.Text = "Day";
            quadropdown.SelectedItem.Text = "Select";
            check.Checked = false;
        }
        public string FName { get; set; }
        public string LName { get; set; }
        public string Gender { get; set; }
        public string Year { get; set; }
        public string Month { get; set; }
        public string Day { get; set; }
        public string Qualification { get; set; }
        public void assingValues()
        {
            FName = fnametxt.Text;
            LName = lnametxt.Text;
            Gender = radioGeder.SelectedItem.Text; 
            Year = yeardropdown.SelectedItem.Text;
            Month = monthdropdown.SelectedItem.Text;
            Day = daydropdown.SelectedItem.Text;
            Qualification = quadropdown.SelectedItem.Text;
    lblresult.Text = "First Name :" + FName + " Last Name :" + LName + "Gender:" + Gender + "Year:" + Year + "Month:" + Month + "Day:" + Day + "Qualification:" + Qualification;
    if (check.Checked == true)
    {
        lblresult.Text = lblresult.Text+"Terms and Conditions.";
    }
        }
    }
}
  This is the error i'm getting..