see also : How to Display Data in ComboBox - VB Net 2013
After have show data in datagridview, you just place code below to set column width in the form :
For example :
DataGridView1.Columns(0).Width = 70
DataGridView1.Columns(1).Width = 150
DataGridView1.Columns(2).Width = 60
DataGridView1.Columns(3).Width = 60
With code above, you can change value width according to your wishes
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