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GetVariableValue Problem

Dear guys:

about the method "GetVariableValue",the help file says like this--PC-DMIS variables only hold values during execution; at learn time PC-DMIS variables have a value of zero. The GetVariableValue and SetVariableValue methods only change a variable's value during the script's execution. If you want to permanently change a value of a variable inside PC-DMIS, you should use the PutText method instead.

when my mouse enter the parameter,it shows the result on the screen.but how can i get that value?(offline software,but the program has been run before)



string ReturnValue="";
Variable tmpVarValue;
pcdPartProgram = pcdSession.ActivePartProgram;
tmpVarValue = pcdPartProgram.GetVariableValue(VarName);
if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_STRING)
{
ReturnValue = tmpVarValue.StringValue;
}
else if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_DOUBLE)
{
ReturnValue = tmpVarValue.DoubleValue.ToString("F3");
}
else if (tmpVarValue.VariableType == VARIABLE_TYPE_TYPES.VARIABLE_TYPE_LONG)
{
ReturnValue = tmpVarValue.LongValue.ToString("F3");
}

then i get 0.000,whie the shown result is -0.071.and i wanna get the value -0.071