You define a DataGridTableStyle and do it there:
Dim ts As DataGridTableStyle = New DataGridTableStyle
DataGrid1.TableStyles.Add(ts)
ts.MappingName = "<Your table name here>"
DataGrid1.TableStyles(0).GridColumnStyles(0).Width = 200
Note that in this line:
ts.MappingName = "<Your table name here>"
the "<Your table name here>" portion should be the name you gave the table when it was filled. For example, if you filled your table like so:
DataAdapter1.Fill(DataTable1, "MyTable")
the line would be:
ts.MappingName = "MyTable"
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