how Datepicker value save in databaseC#?

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dateTimePicker1.Format = DateTimePickerFormat.Custom;<br />
            dateTimePicker1.CustomFormat = "dd/MM/yyyy";<br />
            dateTimePicker2.Format = DateTimePickerFormat.Custom;<br />
            dateTimePicker2.CustomFormat = "dd/MM/yyyy"; <br />
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            DateTime date = dateTimePicker1.Value;<br />
            this.Text = date.ToString();<br />
            DateTime date1 = dateTimePicker2.Value;<br />
            this.Text = date1.ToString();<br />
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            SqlConnection myConnection = new SqlConnection("Server=(local);Database=ERP2014-2015;Trusted_Connection=True;");<br />
            myConnection.Open();<br />
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            using (SqlConnection connection = new SqlConnection(connectionString))<br />
            {<br />
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                SqlCommand myCommand = new SqlCommand();<br />
                myCommand.CommandText = "INSERT INTO dbo.ComapnyName([CompanyName], [GovermentID], [RegistrationNumber], Address1, Address2, PostalCode, City, FromDate, ToDate) VALUES ('" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "','" + textBox5.Text + "','" + textBox6.Text + "','" + textBox8.Text + "','" + textBox7.Text + "," + date.ToString() + "," + date1.ToString() + "')";<br />
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