I am glad you have found out the solution.
Actually, in Type.GetType() document, you will see that:
"If typeName includes only the name of the Type, this method searches in
the calling object's assembly, then in the mscorlib.dll assembly. If
typeName is fully qualified with the partial or complete assembly name,
this method searches in the specified assembly."
System.Web.UI.WebControls.TextBox is not a type in your assembly or in
mscorlib.dll, so you should specify the assembly name(System.Web).
Hope this information make sense to you.
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