c# - Change the min scale without changing the max on a chart -

I have a chart that should give the end user the minimum and maximum on runtime. The parameter 0 is omitted, so if the value is selected the statement will be executed. The problem I am facing is that I need only the minimum to change and the maximum stay is to stay the same as it was. I can not understand what should go in the maximum value. Any suggestions?

  int thirteen = convert.Toint32 (this parameter. [13]. Value); If (thirteen; gt;) {(see spline series) xrChart1.Series [0]. Views). Axis X.Range.Involution = this. Parameter [13]. value; (SplineSeriesView) xrChart1.Series [0]. Views). Axis X. Range.maxvalue = // Join something here! }    
 
 
 Just take the statement out completely if the price of doing this was " Staying the same, "is not required.