cONVERSION FAILED WEN CONVWERTING VARCHAR VALUE HELLO IN TO

Question

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Data.SqlClient;

namespace Invoice_Genraton

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

}

private void textBox1_TextChanged(object sender, EventArgs e)

{

}

SqlDataAdapter da;

DataSet ds;

SqlConnection con;

private void btnSubmit_Click(object sender, EventArgs e)

{

con = new SqlConnection("Data Source=localhost;Initial Catalog=allcare;Integrated Security=True;Pooling=False");

da = new SqlDataAdapter("insert into [prudhvi] values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','"

+ textBox4.Text + "','" + textBox5.Text + "','" + textBox6.Text + "','" + textBox7.Text + "','" + textBox8.Text + "','" +

textBox9.Text + "','" + textBox10.Text + "','" + "')", con);

ds = new DataSet();

da.Fill(ds);

Form2 f2 = new Form2();

this.Hide();

f2.label12.Text = textBox1.Text.ToString();

f2.label13.Text = textBox2.Text.ToString();

f2.label14.Text = textBox3.Text.ToString();

f2.label15.Text = textBox4.Text.ToString();

f2.label16.Text = textBox5.Text.ToString();

f2.label17.Text = textBox6.Text.ToString();

f2.label18.Text = textBox7.Text.ToString();

f2.label19.Text = textBox8.Text.ToString();

f2.label20.Text = textBox9.Text.ToString();

f2.label21.Text = textBox10.Text.ToString();

int n1 = int.Parse(textBox9.Text);

int n2 = int.Parse(textBox10.Text);

int total = n1 + n2;

f2.label22.Text = total.ToString();

f2.Show();

}

}

}