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Director of Development

John Kininjjew

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Does the error occurs only on the &quot;Serial&quot; string, not on the previous ones?<br />
Was this line modified recently? If yes, are you sure all the characters are 7bit ASCII symbols, not some other languages?<br />
Try to cache the data type objects in the beggining of the BuildItemsTable() method and use the same data type objects on each similar type Add() methods.
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Does the error occurs only on the "Serial" string, not on the previous ones?
Was this line modified recently? If yes, are you sure all the characters are 7bit ASCII symbols, not some other languages?
Try to cache the data type objects in the beggining of the BuildItemsTable() method and use the same data type objects on each similar type Add() methods.

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The error was the decimal spelling. I really don't know why the debugger stopped on the Serial entry! Weird!
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The error was the decimal spelling. I really don't know why the debugger stopped on the Serial entry! Weird!

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If you followed my second advice, the error would be eliminated by itself. Please consider to make more optimal code.
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If you followed my second advice, the error would be eliminated by itself. Please consider to make more optimal code.

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For some reason this has now become and issue. I am really not sure how as its been working fine. <br />
I am getting a System.ArgumentNullExcepti<wbr />on: ''dataType' argument cannot be null.<br />
Parameter name: dataType'<br />
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I have attached a screen shot of this error and code. Help, I cant seem to see the issue here.<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/03_w13/1290956/System.String-Error.PNG" target="_blank" class="file-inline" title="Code Snippet (69 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>System.String-Error.PNG</a>
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System.String-Error.PNG

For some reason this has now become and issue. I am really not sure how as its been working fine. 
I am getting a System.ArgumentNullException: ''dataType' argument cannot be null.
Parameter name: dataType'

I have attached a screen shot of this error and code. Help, I cant seem to see the issue here.

System.ArgumentNullException: ''dataType' argument cannot be null.

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,

Visual Basic.NET

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.