Conditionally set style for word using C#

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C#

ASP.NET

Hi,


I am automating Word styling using

Microsoft.Office.Interop.Word;

I am in urgently in need of help.

for example.

If the paragraph is like below(with out any number-plain text) need to set one style

When the following terms are used in the mandatory standards and recommended practices for marine safety investigations they have the following meaning.

If the paragraph is like below another style

2.1 An agent means any person, natural or legal, engaged on behalf of the owner, charterer or operator of a ship, or the owner of the cargo, in providing shipping services, including managing arrangements for the ship being the subject of a marine safety investigation.

If the paragraph is like below another style

2.1.1 An agent means any person, natural or legal, engaged on behalf of the owner, charterer or operator of a ship, or the owner of the cargo, in providing shipping services, including managing arrangements for the ship being the subject of a marine safety investigation.

If the paragraph is like below another style

2.1.1.1 An agent means any person, natural or legal, engaged on behalf of the owner, charterer or operator of a ship, or the owner of the cargo, in providing shipping services, including managing arrangements for the ship being the subject of a marine safety investigation.

could you please help how to do this.

Thanks