Need to insert decimal value

I am using visual web developer 2008 and .net 3.5.  I have a simple insert statement that inserts a field value in to my table.  On my web form I have a text field called TextBoxrt. In my table this is a decimal value.  It will hold a dollar value.  When I set my form variable and attempt to insert I get Conversion from string "rt" to type 'Integer' is not valid.

Here is my insert statement and parameterStart Free Trial

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Dim cmd1 As New System.Data.SqlClient.SqlCommand("Insert Into users (rate) Values (@rt)", conn)
 
        cmd1.Parameters.Add("@rt", System.Data.SqlDbType.Decimal, "rt").Value = request.form("TextBoxrt")