How to pass string value grid view`s text box template?

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C#

ASP.NET

C#4.0

Hi,
I have a code that will fetch a data from grid view(grdPurchaseOrder) and the same data from particular row can be assigned to string (stritems) .

Here is my code:

for (int i = 0; i < grdPurchaseOrder.Rows.Count; i++)
{

string stritems = ((TextBox)grdPurchaseOrder.Rows[i].FindControl("txtitems")).Text;
}


Now i have string data,i want to pass the same to the grid view to our desired row....I just need a reverse process of above code,please help me how to insert the string value to a particular row??