How do I perform arithmetic in visual-basic 2015

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VS2015

Hi Everyone,

I am developing project in Visual Basic 2015 using Access Table in Back end.

When I run the following code, I encounter Message for Data type Mismatch in criteria expression, how do I override the problem:

Thanks in advance:

What I have tried:

Private Sub BtnSave_Click(sender As Object, e As EventArgs) Handles BtnSave.Click

AddEmpCmd.Parameters.AddWithValue("@CLBal", (15 - (Convert.ToInt32(TxtClAvail.Text))))
            AddEmpCmd.Parameters.AddWithValue("@FLBal", (6 - (Convert.ToInt32(TxtFlAvail.Text))))

End Sub