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Get Selected Rows in DataGridView

Here is the simple trick to get selected value in DataGridView in C#
object value = dataGridView1.Rows[e.Cell.RowIndex].Cells[3].FormattedValue;
 object value1 = dataGridView1.Rows[e.Cell.RowIndex].Cells[4].FormattedValue;
 object GSTPercentage = dataGridView1.Rows[e.Cell.RowIndex].Cells[5].FormattedValue;

    if (value == "" || value1 == "" || GSTPercentage == "")
       return;

   double result = Convert.ToDouble(value);
  double result1 = Convert.ToDouble(value1);
  double resultGST = Convert.ToDouble(GSTPercentage);

    double NetValue = (result * result1) * resultGST;
   dataGridView1.Rows[e.Cell.RowIndex].Cells[6].Value = Convert.ToString(NetValue);
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