Hi Siva,
When you save the wrong spelling is being entered, what exactly do you mean?
Is the end of the word being cut off or are random letters through the word missing?
Even though the SetText() method doesn't work for you have you tried setting the text or value properties directly? Eg EntryField.Text = "Some Text" or EntryField.Value = "Other text".
You may be trying to interact with 3rd party controls which don't support the Text property. In this instance you should talk to one of the developers on the project and ask how to interact with the controls. They may be able to offer assitance.