resize image - sql or C#

Thank you. I rewrote the function as I do not want to modify the size of the image it self, but just resize it in the html text.

 

public string[] ResizeImage(int width,int height)
    {
        int maxWidth = 500;
        if(maxWidth<=width){
            width = maxWidth;
            height = height * width / maxWidth;
        }
        string[] arr = { width.ToString(), height.ToString() };
        return arr;
    }

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I am not sure how I loop the string call the method and resize height and width in the string it if the width exceeds 500 px.  
Here is an example of text string with 2 images. After modification the width is 500 (1000) and height is 250(500). The second image is unchanged as the width is less then 500px.
Before:
Description of Pic1 <img alt="" style="width: 1000px; height: 500px;" src="/upload/MyImage.gif" /> and details of pic2 <img alt="" style="width: 300px; height: 278px;" src="/upload/MyImage2.gif" />
After:
Description of Pic1 <img alt="" style="width: 500px; height: 250px;" src="/upload/MyImage.gif" /> and details of pic2 <img alt="" style="width: 300px; height: 278px;" src="/upload/MyImage2.gif" />