Determines the index of the System.Web.Services.Protocols.SoapHeader in the System.Web.Services.Protocols.SoapHeaderCollection.
- header
The System.Web.Services.Protocols.SoapHeader to locate in the System.Web.Services.Protocols.SoapHeaderCollection.
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The index of the header parameter, if found in the System.Web.Services.Protocols.SoapHeaderCollection; otherwise, -1.