how to bind multiple lines of text in repeater

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C#

ASP.NET

I need to bind multiple lines of text from backend in repeater..
i have used this..
Text='<%#Limit(Eval("feedback_details"),40)%>'

protected string Limit(object Desc, int length)
    {
    StringBuilder strDesc = new StringBuilder();
    strDesc.Insert(0, Desc.ToString());

    if (strDesc.Length > length)
    {
        return strDesc.ToString().Substring(0, length) + "...";
    }
    else return strDesc.ToString();
    }

it displays the text in same line like this
this is a sample.......

i want to implement like this
this is a sample paragraph.
this is a sample paragraph.
this is a....


like in google search..
it should display 3 to 4 lines from backend after that i have to use read more option

kindly help me..