i have a variable MatchRuleFields whose message type is .Net class system.string
i am assigning MatchRuleFields ="a,b,c"
i have another variable Variable_1 whose message type is also .Net class system.string
when i try this statement
Variable_1=MatchRuleFields.Split(','); in expression shape in Biztalk server 2006
iam getting an error
cannot implicitly convert type 'System.String[]'to 'System.String'
how to correct this error

The error pretty much tells you the problem: you are trying to assign the return value of .Split (which is an array) to a variable of type string.

You need to declare Variable_1 as a string array such as:

string[] Variable_1 = MatchRuleFields.Split(',');


hth.
-Doug

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