Passing values from NumericUpDown control to SQL database

Question

I have some field in my table formatted with four decimal places (i.e. 0.0125).

I am using a NumericUpDown object in Visual Basic to collect numbers which I then want to pass to my database.

Unfortunately when I run my code I get the following error:

Conversion from string " (CallType,ChargeCode,Destinatio" to type 'Double' is not valid.

Here is a copy of the code I am using to push the values to the database.

Using cmdc = New SqlCommand("INSERT INTO " & TextBox2.Text
                             & " (CallType,
                                  ChargeCode,
                                  Destination,
                                  TariffUsed,
                                  (case when chargecode in ('" + Combobox2.text + "') then '" + NumericUpDown1.value + "'
                                  else Peak*2 end) as Peak,
                                  (case when chargecode in ('" + Combobox2.text + "') then '" + NumericUpDown2.value + "'
                                  else OffPeak*2 end) as OffPeak,
                                 (case when chargecode in ('" + Combobox2.text + "') then '" + NumericUpDown3.value + "'
                                 else Weekend*2 end) as Weekend,
                                 (case when chargecode in ('" + Combobox2.text + "') then '" + NumericUpDown4.value + "'
                                 else Setup*2 end) as Setup,
                                 (case when chargecode in ('" + Combobox2.text + "') then '" + NumericUpDown5.value + "'
                                 else MinimumCharge*2 end) as MinimumCharge,
                                 ChargeCap,
                                 InitialUnits,
                                 InitialCharge,
                                 InitialPeak,
                                 InitialOffPeak,
                                 InitialWeekend,
                                 BillingUnit,
                                 MinimumUnits,
                                 RateType
                          FROM " & ComboBox1.Text & "", con)

con.Open()
cmdc.ExecuteNonQuery()
con.Close()
End Using
End Using

As DOUBLE doesn't exist in SQL, I have the destination fields configured as FLOAT.

Is it possible to pass values from the NumericUpDown into my database, and if so what is the correct format?

Answer 1

Big thanks to @Paqogomez:

The ToString() fixed the issue.

Here is the working code:

Using cmdc = New SqlCommand("Insert into " & TextBox2.Text & " Select CallType,ChargeCode,Destination,TariffUsed,(case when chargecode in ('" + ComboBox2.Text + "') then " + NumericUpDown1.Value.ToString() + " else Peak*2 end) as Peak,(case when chargecode in ('" + ComboBox2.Text + "') then " + NumericUpDown2.Value.ToString() + " else OffPeak*2 end) as OffPeak,(case when chargecode in ('" + ComboBox2.Text + "') then " + NumericUpDown3.Value.ToString() + " else Weekend*2 end) as Weekend,(case when chargecode in ('" + ComboBox2.Text + "') then " + NumericUpDown4.Value.ToString() + " else Setup*2 end) as Setup,(case when chargecode in ('" + ComboBox2.Text + "') then " + NumericUpDown5.Value.ToString() + " else MinimumCharge*2 end) as MinimumCharge,ChargeCap,InitialUnits,InitialCharge,InitialPeak,InitialOffPeak,InitialWeekend,BillingUnit,MinimumUnits,RateType from Daisy_March2014", con)
con.Open()
cmdc.Parameters.AddWithValue("@tarrif2", TextBox2.Text)
cmdc.Parameters.AddWithValue("@DateTime", DateTime.Now())
cmdc.ExecuteNonQuery()
con.Close()
End Using
End Using

*Use at your own risk, should really be parametized!