D34th_c0d3r on 6:47 PM 05/26/2020: very nice one and easy
text1 = anything bigger or equal 4
text2 = X398(text1)33CEA639
D34th_c0d3r on 6:47 PM 05/26/2020: very nice one and easy
text1 = anything bigger or equal 4
text2 = X398(text1)33CEA639
col9 on 5:44 PM 06/02/2020: string text = this.txtName.Text.Substring(0, 4).ToUpper();
string text3 = this.productId1.Text;
string text4 = this.productId2.Text;
string text5 = this.productId3.Text;
string value = text3 + text + text4 + text5;
you can see this in dnspy or another .net decompiler
DioAstolfo on 5:30 PM 06/24/2021: Username: DIOS
SerialKey: X398DIOS33CEA639
sweety on 10:24 PM 01/19/2022: Username: CRACK
SerialKey: X398CRACK33CEA639
4HM33D on 9:19 PM 05/19/2024: name : ☺☺☺☺
Serial key : X398☺☺☺☺33CEA639
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Solution by 0xThiebaut: Nice 'n easy. Perfect for a first ride with dnSpy.