Thread: simple project

  1. #1
    Registered User
    Join Date
    Aug 2012

    simple project

    I'm doing a simple week end project. In this i need to know a event. Which is A form has text box and label which is student roll no. And name. After enter the 6 digit student roll no in the the textbox corresponding roll no 's name have to display frm a label. With out pressing any button. Which event is suitable for this case.

    Thank you

  2. #2
    (?<!re)tired Mario F.'s Avatar
    Join Date
    May 2006
    There's more options, but you may want to start with a simple TextChanged event: C# TextChanged Event

    Although not mentioned there, it is a good practice to always check your textbox value for an empty string or clearly invalid data before doing any expensive computation like accessing a database to fetch your student's name.

    void rollNumber_TextChanged(object sender, EventArgs e)
        if (rollNumber.Text.Trim() == String.Empty || rollNumber.Text.Length < 5)
        rollName.Text = GetStudent(rollNumber.Text);
    Originally Posted by brewbuck:
    Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.

  3. #3
    Super Moderator VirtualAce's Avatar
    Join Date
    Aug 2001
    Optionally you can use data binding and data validation via IDataErrorInfo.

    Data binding:


  4. #4
    Registered User
    Join Date
    Aug 2012
    Thank you..!!

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