How to add new row to grid view dynamically when gridview has paging

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ASP.NET

C#3.5

private void SetPreviousData()
{

int rowIndex = 0;
if (ViewState["CurrentTable"] != null)
{
DataTable dt = (DataTable)ViewState["CurrentTable"];
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{

TextBox boxDatePosted = (TextBox)NewGridView.Rows[i].Cells[1].FindControl("txtDatePosted");//names given on aspx design
TextBox boxCheckNumber = (TextBox)NewGridView.Rows[i].Cells[2].FindControl("txtCheckNumber");
TextBox boxCheckAmount = (TextBox)NewGridView.Rows[i].Cells[3].FindControl("txtCheckAmount");
DropDownList ddl1 = (DropDownList)NewGridView.Rows[i].Cells[4].FindControl("ddlIsDeposits");


//Fill the DropDownList with Data
FillDropDownList(ddl1);
int SetRowData1 = (int) ViewState["SetRowData"];

if (i < dt.Rows.Count - 1)
{

//Assign the value from DataTable to the TextBox
boxDatePosted.Text = dt.Rows[i]["DatePosted"].ToString();
boxCheckNumber.Text = dt.Rows[i]["CheckNumber"].ToString();
boxCheckAmount.Text = dt.Rows[i]["CheckAmount"].ToString();

//Set the Previous Selected Items on Each DropDownList on Postbacks
ddl1.ClearSelection();
ddl1.Items.FindByText(dt.Rows[i]["IsDeposits"].ToString()).Selected = true;

}



rowIndex++;
}
}
}

ViewState["SetRowData"] = 0;
}