c# split by string delimiter wont work

I had some code that would use a character as a delimiter.
I found that there was a possibiliyt the character would be in the list so I have to split on a more complicated string.

When I try what is below, it says I can't convert "delim1" from a string to a char.  I don't want to use a char, I want a string and the split overload has string as an option.  Why won't this work?

            string delim1 = "<;>";

            string[] arrSplitContent = strContent.Split(delim1, StringSplitOptions.RemoveEmptyEntries);                  
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