System.FormatException: Input string was not in a correct format. at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at System.Int16.Parse(String s, NumberStyles style, NumberFormatInfo info) at System.Convert.ToInt16(String value) at ASP.step4_aspx.Page_Load(Object sender, EventArgs e) in D:\wwwroot\IQCalc\step4.aspx:line 38 Johnsonite IQ Calculator: Step 4 - Maintenance Costs
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  Johnsonite IQ
Project Size
Maint. Cost/Sq. Ft. 1
Total Maint. Cost
1 Maintenance cost is the national average cost per square foot for maintaining this material. This is an annual cost.