SQL Stored Procedure - Insert Data Depending On User Input

I created a sql stored procedure that will insert data for me depending on user input. Now I would like to know usually I would do something of this nature

Dim con As New SqlConnection(connectionString)
Dim cmd As New SqlCommand("usp_userinput", con) 'references connectionstring and calls store procedure
cmd.CommandType = Data.CommandType.StoredProcedure 'sets default to be storeprocedure
lblMessage.Text = String.Empty
With cmd.Parameters
If (Session("UserInitials")) IsNot Nothing Then
.AddWithValue("@UserInitials", Session("UserInitials").ToString())
End If
End With

That is just an example how i usually approach calling the stored procedure in vb. However for this particular form I am going to have 50 or 60 textboxes which each one would require a session state variable.Seems a little tedious to have to create a session state variable for each textbox on the form.