how to delete insert update data using datagrid vew

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C#

.NET

C#4.0

.NET4

i am having datagrid view in my form and now i want to insert, delete update data through datagrid view .I have created simple application for insert
code is as follows

private void Form1_Load(object sender, EventArgs e)
       {
           
           com.Connection = con;

       }

 private void button4_Click(object sender, EventArgs e)
        {
SqlConnection con=new SqlConnection("Data Source=C:\asd;Initial Catalog=shivani;  providerName=System.Data.SqlClient ");
        SqlCommand com = new SqlCommand();


if (txtname.Text != "" & txtage.Text != "")
           {
               con.Open();
               com.CommandText = "insert into customer(customerName,customerCode) values ('" + txtname.Text + "','" + txtage.Text + "')";
               com.ExecuteNonQuery();
               con.Close();
               MessageBox.Show("record inserted");
           }
           else MessageBox.Show("data entry error");
}

Now i want to do same thing through datagrid view...
so tell me how to do that

thanks in advance