C#NET2008 SQL String using DATE BETWEEM Statement.

Hullo Good Friends,

I need your help. Please Help me. Thank You.I encounter a very interesting problem regarding Window Application using  C#NET3.5, SqlServer2000. Problem using SQL String using Date Between statement.

I am using date parameters from 2 input textbox to retrieve Customer Invoice table to fill the DataGridView and it's not working as the problem seem to be caused my the SQL String Statement : OrderDate Between DateFrom and DateTo

Error message:The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value

private void FFillDataGridView()

{ 

DateTime DateFrom =Convert.ToDateTime(this.txtDateFrom.Text);<-causing error

DateTime DateTo =Convert.ToDateTime(this.txtDateTo.Text); <- causing errror message

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           string strsql =  " Select OrderID, ProductID,";                                                                                                                                                                                                                                                          

  strsql += " Convert(varchar(10), OrderDate, 103) as [OrderDate], ";

  strsql += " Convert(Numeric(10,2), unitprice, 2) as [UnitPrice], ";

  strsql += " From tblInvoices ";

  strsql += " Where (CustomerID = '" + strCustID + "')";

  strsql += " AND (OrderDate between  DateFrom + "'";  <-- not working

       strsql += " AND '" +  DateTo + "')";  <-- not working

 Try

  {                

     sqlconn = new SqlConnection(connstr);       sqlconn.Open();

     DA = new SqlDataAdapter(strsql, sqlconn);

     DS = new System.Data.DataSet();

     DS.Clear();

     DA.Fill(DS, "Invoice");

     this.dataGridView1.DataSource = DS.Tables["Invoice"];

   }

Catch (Exceptional Ex)

 {   messagebox.show(ex.message);  }

}

Thank you for helping me.

Have A Good Day,

Cheers,

Lennie