string IDataErrorInfo.this[string columnName]
{
get
{
if (columnName == "FName")
{
if (this.fName == null)
{
return("Please enter reader's first name");
}
else if (fName.Trim() == string.Empty)
{
return("First name is required");
}
else if (this.fName.Length > 50)
{
return("First name must not exceed 50 characters");
}
else if (isNumeric(this.fName))
{
return("First name cannot contain numeric characters");
}
}
else if (columnName == "LName")
{
if (this.lName == null)
{
return("Please enter reader's last name");
}
else if (this.lName.Trim() == string.Empty)
{
return("Last name is required");
}
else if (this.lName.Length > 50)
{
return("Last name must not exceed 50 characters");
}
else if (isNumeric(this.lName))
{
return("Last name cannot contain numeric characters");
}
}
else if (columnName == "Id")
{
int entered_id, max_id = ReaderService.GetMaxId();
if (!int.TryParse(this.id, out entered_id))
{
return("ID must be an integer");
}
else
{
if (entered_id < 1)
{
return("ID must be at least 1");
}
else if (entered_id > max_id)
{
return("ID must not excced " + max_id.ToString());
}
}
}
return(null);
}
}