Código
Dim i, j As Integer Dim tabla(5, 5) As String 'Pedir valores With DataGridView1 .Columns.Add("", "") .Columns.Add("", "") .Columns.Add("", "") .Columns.Add("", "") .Columns.Add("", "") .RowCount = 5 For i = 0 To 4 For j = 0 To 4 tabla(i, j) = InputBox("Digite un número") .Item(i, j).Value = tabla(i, j) Next Next End With 'Filas impares Dim fila1 As Integer = 0 Dim fila3 As Integer = 2 Dim fila5 As Integer = 4 Dim sumFila1 As Integer = (From cell As DataGridViewCell In DataGridView1.Rows(fila1).Cells Select CInt(cell.Value)).Sum Dim sumFila3 As Integer = (From cell As DataGridViewCell In DataGridView1.Rows.Item(fila3).Cells Select CInt(cell.Value)).Sum Dim sumFila5 As Integer = (From cell As DataGridViewCell In DataGridView1.Rows.Item(fila5).Cells Select CInt(cell.Value)).Sum Label1.Visible = True Label1.Text = "La suma de los valores de la primer fila es de " & sumFila1 Label3.Visible = True Label3.Text = "La suma de los valores de la tercera fila es de " & sumFila3 Label5.Visible = True Label5.Text = "La suma de los valores de la quinta fila es de " & sumFila5