Merge Gridview Rows with same values in cells using Asp.net and C#

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   protected void GV_PerformanceObjective_RowDataBound(object sender, GridViewRowEventArgs e)

    {

        for (int i = GV_PerformanceObjective.Rows.Count - 2; i >= 0; i--)

        {

            GridViewRow row = GV_PerformanceObjective.Rows[i];

            GridViewRow preRow = GV_PerformanceObjective.Rows[i + 1];

            string currRow = ((LinkButton)row.FindControl("lbtn_EditObjective")).Text.Trim();

            string prevRow = ((LinkButton)preRow.FindControl("lbtn_EditObjective")).Text.Trim();

            if (currRow == prevRow)

            {

                row.Cells[0].RowSpan = preRow.Cells[0].RowSpan < 2 ? 2 : preRow.Cells[0].RowSpan + 1;

                preRow.Cells[0].Visible = false;

            }

        }

    }