zxing qr code encoder example c# Part 5: Manipulating Excel Objects in C#.NET

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Part 5: Manipulating Excel Objects
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Microsoft Office Excel 2003 Programming Inside Out
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Private Sub PutData() Dim r As Long If IsNumeric(RowNumber.Text) Then r = CLng(RowNumber.Text) Else MsgBox "Illegal row number" Exit Sub End If If r > 1 And r < Cells(r, Cells(r, Cells(r, Cells(r, Cells(r, Cells(r, LastRow Then 1) = CustomerId.Text 2) = CustomerName.Text 3) = City.Text 4) = State.Text 5) = Zip.Text 6) = DateAdded.Text
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DisableSave Else MsgBox "Invalid row number" End If End Sub
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The error checking isn t absolutely necessary, but it probably is a good idea just in case someone put an invalid value in the RowNumber text box, jumped to another application, and then came back. In that scenario, it s possible to enter a different value in the RowNumber text box without retrieving any data. Notice that after the data is saved to the worksheet, DisableSave routine is called. This is necessary because the data on the user form now represents the same data stored on the worksheet.
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Pressing the Add button calls the CommandButton7_Click event, which displays the first blank row at the end of the worksheet. Because the LastRow variable points to this row, it s merely a matter of setting the Text property of the RowNumber control to this value using code like this:
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Private Sub CommandButton7_Click() RowNumber.Text = FormatNumber(LastRow, 0) End Sub
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Part 5: Manipulating Excel Objects
Creating Advanced User Forms
Validating Data
At this point, the form is fully capable of capturing data from the user and inserting it into the worksheet. The form also allows the user to edit the values already stored in the worksheet. The only limitation is that none of the data is validated for correctness. For instance, it s possible to enter an invalid date as part of the DateAdded field. Also, there are no checks to ensure that the CustomerId value is numeric. Finally, it s possible to enter the wrong two-character state code. Here are some techniques that you can use to ensure that the data is valid before it reaches your worksheet. The first technique involves using the KeyPress event to ensure that the user can enter only a particular type of information. For example, you could ensure that the user can only enter numbers into the CustomerId control using this code:
Private Sub CustomerId_KeyPress(ByVal KeyAscii As MSForms.ReturnInteger) If KeyAscii < Asc("0 ) Or KeyAscii > Asc("9 ) Then KeyAscii = 0 End If End Sub
Tip Defining Events Double-clicking the CustomerId control on the user form will automatically take you to the CustomerId_Change event. If the event doesn t exist, it will automatically be created. If you want to handle a different event, simply choose the name of the event from the drop-down list at the top of the code window and the Visual Basic Editor will automatically create a blank event with the appropriate parameters. Another approach involves using the Exit event. In the Exit event associated with a particular control on the user form, you can determine if the user made an error and highlight the background to give the user a visual clue. You can also display a message box that contains a description of the error using code like this:
Private Sub DateAdded_Exit(ByVal Cancel As MSForms.ReturnBoolean) If Not IsDate(DateAdded.Text) Then DateAdded.BackColor = &HFF& MsgBox "Illegal date value" Cancel = True Else DateAdded.BackColor = &H80000005 End If End Sub
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Part 5: Manipulating Excel Objects
Microsoft Office Excel 2003 Programming Inside Out One nice feature of the Exit event is that if you set the Cancel argument to True, the user will be unable to switch the focus to a different control until the text box contains a proper date. Remember that you also need to set the background color to Window Background (&H80000005) if there isn t an error, to reset any previous error conditions. This is handled by the Else clause. The final technique used in this application prevents errors by substituting a combo box con trol in place the text box control for State. Because the user is limited to choosing one value from the provided list of values, it becomes impossible to enter invalid data.
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