Draw line in PDF using ItextSharp

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.NET

I am facing difficulty while drawing line in PDF using ItextSharp. I have draw a line in pdf using

DrawLine(writer, 25f, document.Top - 520f, document.PageSize.Width - 25f, document.Top - 520, new Color(31, 73, 125));

If there is one record in table then it is ok, but when more than one data comes in table it overwrite the line. Please help to solve this.