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وعليك السلام ورحمة الله
تفضل اخي

كود :

   Private Sub DataGridView1_CellClick(sender As Object, e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellClick
       If DataGridView1.Rows(0).Cells(0).State = DataGridViewElementStates.Selected Then
           DataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect
           DataGridView1.Rows(0).Selected = True
       End If


   End Sub