Conversion failed when converting datetime from character string when selecting date in monthCalender.

Quote:

Conversion failed when converting datetime from character string.

Quote:

nvarchar(255)

public partial class Search : Form
    {
        SqlConnection con = new SqlConnection("server=.;uid=sa;pwd=123;database=Externetworks Interviews");
        DataSet ds = new DataSet();
        public Search()
        {
            InitializeComponent();
            
        }

        private void Search_Load(object sender, EventArgs e)
        {
            // TODO: This line of code loads data into the 'externetworks_InterviewsDataSet1.Interviews' table. You can move, or remove it, as needed.
            this.interviewsTableAdapter1.Fill(this.externetworks_InterviewsDataSet1.Interviews);
            // TODO: This line of code loads data into the 'externetworks_InterviewsDataSet.Interviews' table. You can move, or remove it, as needed.
            //this.interviewsTableAdapter.Fill(this.externetworks_InterviewsDataSet.Interviews);
           
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "")
            {
                MessageBox.Show("Please Enter Order no", "ERROR");
                textBox1.Focus();
            }
            else
            {
                SqlCommand cmd = new SqlCommand("Select * from Interviews where orderno= " + int.Parse(textBox1.Text), con);
                SqlDataAdapter da = new SqlDataAdapter();
                da.SelectCommand = cmd;
                da.Fill(ds,"Interviews" );
                dataGridView1.Show();
                dataGridView1.DataSource = ds.Tables["Interviews"];
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            SqlCommand cmd = new SqlCommand("Select * from Interview", con);
            dataGridView1.Show();
        }

        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            Interviews obj = new Interviews();
            obj.Show();
            this.Hide();
        }

        private void monthCalendar1_DateChanged(object sender, DateRangeEventArgs e)
        {
            
                DataTable dt = new DataTable();
                DateTime mdate = monthCalendar1.SelectionRange.Start.Date;
                DateTime start = monthCalendar1.SelectionStart;
                DateTime end = monthCalendar1.SelectionEnd;
                SqlCommand cmd = new SqlCommand("select * from Interviews where intvwdate=@intvwdate", con);

                cmd.Parameters.AddWithValue("@intvwdate", Convert.ToDateTime(monthCalendar1.SelectionStart));
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(ds, "Interviews");
                dataGridView1.Show();
                dataGridView1.DataSource = ds.Tables["Interviews"];
            

        }

        private void linkLabel2_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            Login obj = new Login();
            obj.Show();
            this.Hide();
        }
        
    }
}