While add pin it throw exception "Value does not fall within the expected range"
So your question was branched to a new question but it is marked answered.
You might want to explain the solution a bit though
I am using ArgMap 10.6 version.
I created .mxd with GDB file after load that file from .Net desktop application.
Map loaded but i try to add marker it will throw exception as previously i said.
Although your tag says ArcGIS Desktop.. perhaps you could explain what you are doing that results in that error message.
ArcMap? ArcGIS Pro?
Pin?
Do you have a screen grab? to show what specifically you are referring to?
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