Button3,4,5,

Button

for (int j = 0 ; j < dataGridViewX1.Rows.Count; j++)

{

dataGridViewX1.Rows[j].Cells[ 2 ].Value= "True";

}

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Button 4

for (int j = 0 ; j < dataGridViewX1.Rows.Count; j++)

{

dataGridViewX1.Rows[j].Cells[ 3 ].Value= "True";

}

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Button 5

for (int j = 0 ; j < dataGridViewX1.Rows.Count; j++)

{

dataGridViewX1.Rows[j].Cells[ 4 ].Value= "True";

}

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Button 6

for (int j = 0 ; j < dataGridViewX1.Rows.Count; j++)

{

dataGridViewX1.Rows[j].Cells[ 5 ].Value= "True";

}

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