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Gets or sets the title of the data-validation error dialog box.
This title is shown in the error alert when a user enters invalid data and error alerts are enabled.
string ErrorTitle { get; set; }
Property ErrorTitle As String
IValidation validation = worksheet.Range["A1"].Validation;
validation.Add(ValidationType.Whole, ValidationAlertStyle.Stop, ValidationOperator.Between, 1, 10);
validation.ErrorTitle = "Invalid Number";
string errorTitle = validation.ErrorTitle;