In some applications, user may need to invoke a spell checker to check spelling for the text entered. We can invoke MS word's spell checker by writing few lines of code.

Open a new project, draw a text box and a command button in the form. Add MS word object library in references. Then write the following code in the command button's click event.

Public Sub Command1_Click()
    'Create an instance of word application
    Dim wb As New Word.Application
    Dim oNewdoc As Object
 
    'Add one new document object
    Set oNewdoc = wb.Documents.Add
 
    'Insert the text entered in the Text box to the document
    wb.Selection.TypeText Text1.Text
 
    'Invoke the Spell checker
    retStr = oNewdoc.CheckSpelling()
 
    'Select the corrected text in the document
    wb.Selection.WholeStory

    'Copy the selected text to Clipboard
    wb.Selection.Copy

    'Paste the text to the text box
    Text1.Text = Clipboard.GetText

    'Close the newly added document object without saving
    oNewdoc.Close False
    wb.Quit
 
    Set oNewdoc = Nothing
    Set wb = Nothing
 
    Me.SetFocus

End Sub

After entering the code, run the project and enter some text in the text box. Then click the command button to invoke the spell checker.