If you add a handler for DataGrid.ItemDataBound, you can explicitly set a column value from your Dictionary. The very simplest example:

protected void OnItemDataBound(object sender, DataGridItemEventArgs e) {     myclass mine = (myclass) e.Item.DataItem;      int cellindex = 5;     e.Item.Cells[cellindex].Text = mine.mydict["thekey"]; } 

I am not familiar with the works of the DataGrid bindings but binding in general can be done on any public property. Try binding to Key and Value on the Dictionary

Another option is to add a property to your class that returns the value for that specific key.

public string TheKey {             get { return MyDictionary["thekey"]; } } 

(The purists out there might not like the idea of adding a property to your object for this reason, but it makes for a simple solution.)