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The error message is quite right, the soution is:

bool yn = false;
bool yn1 = true;
if (yn)
{
}
else if (yn1)
{
}
else
{
}

Other conventions that may trap the experienced vb programmer

• Strings is an ambiguous reference between Microsoft.VisualBasic.Strings and System.Linq.Strings
• The best overloaded method match for string.Split params char has some invalid arguments
• cannot convert from string to char
• The name elseif does not exist in the current context
• Define a function in c sharp
• check if int is null
• vb eqivalent of unload or queryunload
• The left-hand side of an assignment must be a variable, property or indexer
• Possible mistaken empty statement