Thank you for writing.
I am not really sure if I understood right, but if you are using GridViewTextBoxColumn, there is a MaxLength property there in our latest version 2013 Q2 (724):
GridViewTextBoxColumn col =
col.MaxLength = 1;
And, if you are using GridViewMaskBoxColumn, you need to specify the maximum length in the mask. This is so, because it was considered that the priority of the mask should be higher than the MaxLength property.
If you have any other questions or comments, please let me know.
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