Retrieve date from sql and store it in a textbox

if (con.State == ConnectionState.Closed)
{
con.Open();
}
SqlCommand cmd = new SqlCommand("select convert(varchar(10),date,103)as date from table1", con);
maskedTextBox1.Text = (string)cmd.ExecuteScalar();


SqlCommand cmd = new SqlCommand("insert into table1 values('','','','" + Convert.ToDateTime(maskedTextBox1.Text).ToLongDateString() + "')", con);
if (con.State == ConnectionState.Closed)
{
con.Open();
}
cmd.ExecuteNonQuery();