datetimepicker

hi can anyone help me with this it gives me this error: Error 2 Only assignment, call, increment, decrement, and new object expressions can be used as a statement
im new at programming so please help me out

private void BtnSave_Click(object sender, EventArgs e)
{

using (SqlConnection sqlConn = new SqlConnection("Data Source=TANYA-PC;Initial Catalog=biore1;Integrated Security=True"))
{
string sqlQuery = @"INSERT INTO cottonpurchase VALUES(@slipNo, @purchasedate, @farmercode, @farmername, @villagename, @basicprice, @weight, @totalamountbasic, @premium, @totalamountpremium, @totalamountpaid, @certstatus)";



using (SqlCommand cmd = new SqlCommand(sqlQuery, sqlConn))
{
cmd.Parameters.Add("@slipNo", SqlDbType.Int).Value = (!String.IsNullOrEmpty(TxtSlipNo.Text)) ? int.Parse(TxtSlipNo.Text) : (object)DBNull.Value;
cmd.Parameters.Add("@purchasedate", SqlDbType.DateTime).Value = Date.Text;
if (Date.Checked)

{


Date.Value;
}


else
{

DBNull.Value;
}

cmd.Parameters.Add("@farmercode", SqlDbType.Int).Value = TxtFarmerCode.Text;

cmd.Parameters.Add("@farmername", SqlDbType.VarChar, 100).Value = TxtFarmerName.Text;
cmd.Parameters.Add("@villagename", SqlDbType.VarChar, 100).Value = TxtVillageName.Text;
cmd.Parameters.Add("@basicprice", SqlDbType.Int).Value = (!String.IsNullOrEmpty(TxtBasicPrice.Text)) ? int.Parse(TxtBasicPrice.Text) : (object)DBNull.Value;
cmd.Parameters.Add("@weight", SqlDbType.Int).Value = (!String.IsNullOrEmpty(TxtWeight.Text)) ? int.Parse(TxtWeight.Text) : (object)DBNull.Value;
cmd.Parameters.Add("@totalamountbasic", SqlDbType.Int).Value = (!String.IsNullOrEmpty(TxtTotalAmountBasic.Text)) ? int.Parse(TxtTotalAmountBasic.Text) : (object)DBNull.Value;
cmd.Parameters.Add("@premium", SqlDbType.Int).Value = (!String.IsNullOrEmpty(TxtPremium.Text)) ? int.Parse(TxtPremium.Text) : (object)DBNull.Value;
cmd.Parameters.Add("@totalamountpremium", SqlDbType.Int).Value = (!String.IsNullOrEmpty(TxtTotalAmountPremium.Text)) ? int.Parse(TxtTotalAmountPremium.Text) : (object)DBNull.Value;
cmd.Parameters.Add("@totalamountpaid", SqlDbType.Int).Value = (!String.IsNullOrEmpty(TxtTotalAmountPaid.Text)) ? int.Parse(TxtTotalAmountPaid.Text) : (object)DBNull.Value;
//d.Parameters.Add("@yeildestimates", SqlDbType.Int).Value = (!String.IsNullOrEmpty(TxtYeildEstimates.Text)) ? int.Parse(TxtYeildEstimates.Text) : (object)DBNull.Value;
cmd.Parameters.Add("@certstatus", SqlDbType.VarChar, 100).Value = comboBox1.Text;
sqlConn.Open();


WHERE AM I GOING WRONG HERE???