System.InvalidCastException: Conversion from string "" to type 'Integer' is not valid. ---> System.FormatException: Input string was not in a correct format. at Microsoft.VisualBasic.CompilerServices.Conversions.ParseDouble(String Value, NumberFormatInfo NumberFormat) at Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value) --- End of inner exception stack trace --- at Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value) at WebApplication1.Gallery.Page_Load(Object sender, EventArgs e) in C:\Users\engte\Dropbox\Visual Studio 2019\Toypanic\WebApplication1\Gallery.aspx.vb:line 28