Error parsing - Insert value Textbox inside database - asp.net

Question

I have this form ASP.NET that have two textbox and a label, where the user enters only the expiration date in the last textbox, while the others are inserted automatically if the user clicks on another button inside the repeater where the customer code and company name are found.
The problem is that I created a class to do the insertion: I used a stored procedure for the insertion and I used the query parameterization.
When I parse the code and date it gives me 0 and a default date as a result, while my goal is to insert them into a table inside a db and then have it displayed inside the repeater.
P.S. I add that for reading the data I have another class with another stored procedure and that I have some values ​​that are inside another table (the code and the name of the company).
This is the method:
Public Sub INSERT_EXP_DATE_TABLE()
Dim id_customer As Integer
Dim exp_date As Date
Try
cmd.Connection = cn
cmd.CommandType = CommandType.StoredProcedure
MyParm = cmd.Parameters.Add("#COD_CUSTOMER", SqlDbType.Int)
If (Integer.TryParse(txt_COD_CUSTOMER.Text, id_customer)) Then
MyParm.Value = id_customer
Else
MsgBox("customer not found", vbCritical)
End If
MyParm = cmd.Parameters.Add("#COMPANY_NAME", SqlDbType.NVarChar)
MyParm.Value = lbl_COMPANY_NAME.Text.ToString
MyParm = cmd.Parameters.Add("#EXP_DATE", SqlDbType.Date)
If (Date.TryParse(txt_EXP_DATE.Text, exp_date)) Then
MyParm.Value = exp_date
Else
MsgBox("Exp Date not found", vbCritical)
End If
cmd.CommandText = "LST_INSERT_TABLE_01"
cmd.Connection.Open()
cmd.ExecuteNonQuery()
MsgBox("Date registred", vbInformation)
Catch ex As Exception
MsgBox(ex.Message)
Finally
cn.Close()
End Try
End Sub
And this is the stored procedure:
#ID_CUSTOMER int,
#COMPANY_NAME varchar(50),
#EXP_DATE date,
AS
BEGIN
INSERT INTO TABLE
(
ID_CUSTOMER,
COMPANY_NAME,
EXP_DATE,
)
VALUES(
#ID_CUSTOMER,
#COMPANY_NAME,
#EXP_DATE,
)
END

Answer 1

Keep your connection local to the method where it is used. Connections use unmanaged resources so they include a .Dispose method which releases these resources. To ensure that the database objects are closed and disposed use Using...End Using blocks.
Do you parsing before you start creating database objects. Exit the sub so the user has a chance to correct the problem.
Side note: I don't think a message box will work in an asp.net application.
You set up the company name parameter as an NVarChar but your stored procedure declares it as a VarChar. Which is correct?
It is not necessary to call .ToString on a .Text property. A .Text property is already a String.
You are providing a parameter called "#COD_CUSTOMER" but your stored procedure does not have such parameter.
Public Sub INSERT_EXP_DATE_TABLE()
Dim id_customer As Integer
If Not Integer.TryParse(txt_COD_CUSTOMER.Text, id_customer) Then
MsgBox("Please enter a valid number.", vbCritical)
Exit Sub
End If
Dim exp_date As Date
If Not Date.TryParse(txt_EXP_DATE.Text, exp_date) Then
MsgBox("Please enter a valid date.")
Exit Sub
End If
Using cn As New SqlConnection("Your connection string"),
cmd As New SqlCommand("LST_INSERT_TABLE_01", cn)
cmd.CommandType = CommandType.StoredProcedure
With cmd.Parameters
.Add("#ID_CUSTOMER", SqlDbType.Int).Value = id_customer
.Add("#COMPANY_NAME", SqlDbType.VarChar, 50).Value = lbl_COMPANY_NAME.Text
.Add("#EXP_DATE", SqlDbType.Date).Value = exp_date
End With
Try
cn.Open()
cmd.ExecuteNonQuery()
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Using
End Sub

Answer 2

{
string CN = Interaction.InputBox("Enter Company Name","Customer","",-1,-1);
string Cname = Interaction.InputBox("Enter Customer Name", "Customer", "", -1, -1);
SqlConnection con = new SqlConnection(#"Data Source=Adnan;Initial Catalog=Production;Integrated Security=True");
con.Open();
SqlCommand cmd = new SqlCommand("INSERT INTO hello(Company_Name,Customer_name ) VALUES ( #Company_Name,#Customer_name )");
cmd.Connection = con;
cmd.Parameters.Clear();
cmd.Parameters.AddWithValue("#Company_Name", CN.ToString() );
cmd.Parameters.AddWithValue("#Customer_name", Cname.ToString());
}