asked on

I need assistance with a Collection in my ASP.Net application

Hi experts,
I have a collection in my ASP.Net application with C#.Codebehind. I want to display the values
in my collection in a Label control. How can I do this? I tried the following but it gave me an error.
lblErrors.Text = validationErrors.ToString();

Here is the code for my collection.
private Collection<String> ValidateData()
{
Collection<string> validationErrors = new Collection<String>();

if (txtTitle_Edit.Text.Length < 1)
{
validationErrors.Add("Please provide a title for the book.");
}

if (txtAuthorFirstname_Edit.Text.Length < 1)
{
validationErrors.Add("Please enter the Author's last name.");
}

if (txtISBN_Edit.Text.Length < 1)
{
validationErrors.Add("Please enter the book's ISBN#.");
}

if (txtPublisher_Edit.Text.Length < 1)
{
validationErrors.Add("Please enter the publisher's name.");
}
return validationErrors;

}

Thanks in advance
mrotor

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AJRDev

Your validationErrors variable only exists inside the ValidateData() method which is why you can't reference it outside that scope.

You need to do something like this:

private List<String> ValidateData()
{
    List<string> validationErrors = new List<String>();

    if(txtTitle_Edit.Text.Length < 1)
    {
        validationErrors.Add("Please provide a title for the book.");
    }

    if(txtAuthorFirstname_Edit.Text.Length < 1)
    {
        validationErrors.Add("Please enter the Author's last name.");
    }

    if(txtISBN_Edit.Text.Length < 1)
    {
        validationErrors.Add("Please enter the book's ISBN#.");
    }

    if(txtPublisher_Edit.Text.Length < 1)
    {
        validationErrors.Add("Please enter the publisher's name.");
    }
    return validationErrors;
}


private void button1_Click(object sender, EventArgs e)
{
    List<String> validationErrors = ValidateData();
    StringBuilder sb = new StringBuilder();

    foreach(String s in validationErrors)
    {
        sb.Append(s);
        sb.Append(" : "); // Or whatever other formatting you want.
    }

    lblErrors.Text = sb.ToString();
}

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Albert Van Halen

I would use a generic list, convert it to an array and then use String.Join

private List<String> ValidateData()
{
    List<string> validationErrors = new List<String>();

    if(txtTitle_Edit.Text.Length < 1)
    {
        validationErrors.Add("Please provide a title for the book.");
    }

    if(txtAuthorFirstname_Edit.Text.Length < 1)
    {
        validationErrors.Add("Please enter the Author's last name.");
    }

    if(txtISBN_Edit.Text.Length < 1)
    {
        validationErrors.Add("Please enter the book's ISBN#.");
    }

    if(txtPublisher_Edit.Text.Length < 1)
    {
        validationErrors.Add("Please enter the publisher's name.");
    }
    return validationErrors;
}


private void button1_Click(object sender, EventArgs e)
{
    lblErrors.Text = String.Join("<your seperator>", ValidateData().ToArray());
}

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