String imgTexts ; //String that contains the <img texts...
String strToRemove ;
for(int i=1; i<=12;i++)
{
    //build the sctring that is going to be removed
    strToRemove = String.Format(" content=\"test_img image {0} - test_server\" des=\"test_img image {0} - test_server\" ", i) ;
    //replace the strToRemove with a empty string
    imgTexts = imgTexts.Replace(strToRemove, "") ;
}
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solved C# delete some string