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I removed all the event handlers from my map control, thus effectively paring it back to the core ArcGIS functionality. The map painting issue disappeared. I then added the event handlers back in one-by-one to isolate the problem. The problem appears to be a bug in the ArcGIS control where if a map layer is inserted in the code for the OnExtentUpdated event ...


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When the form is resized at run time, the PageLayoutControl and MapControl do not automatically resize. To resize the controls so that they always fill the extent of the form, anchor the controls to the form. If the PageLayoutControl or MapControl contains a lot of data, redrawing this data while the form is resized can be costly.To increase performance, ...


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Try Isolating the problem. If you create a new form add a split control, drop a map control in to one side of it, then reference an mxd in the map control and run the form does the MapControl refresh properly? I tried this exact thing upon reading your question, and it works fine out of the box for me. If it does for you, you could start adding pieces of ...



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