looping with variable control name

[ober0330]

I have this code:

For i = 1 To 4
    For j = 0 To 4
        SQLSTR = "INSERT INTO Coeff (CAL_ID, Curve_Order, Coeff, Coeff_Val) VALUES (" & CALID & ", " & i & ", " & j & ", " & frmRegression.txtCoefficient_ & i & (j) & ")"
        CN.Execute (SQLSTR)
    Next j
Next i

And what I'm trying to do is loop through sets of control arrays to store some variables. It's the following line that I have a problem with:

frmRegression.txtCoefficient_ & i & (j)

I need a way to make it look for that control array and then get that value from that control array. I know there has to be an easy way to do this.