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Gets or sets the title of the data-validation input dialog box.
Use this property to retrieve or configure the title for the input prompt of a validated cell or range.
string InputTitle { get; set; }
Property InputTitle As String
IValidation validation = worksheet.Range["A1"].Validation;
validation.Add(ValidationType.Whole, ValidationAlertStyle.Stop, ValidationOperator.Between, 1, 10);
validation.InputTitle = "Tips";
string title = validation.InputTitle;