Assign textbox text outside aspxgridview on HtmlRowPrepared event

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DevExpress

Hi all I have written a code to display the textbox text which is outside aspxgridview by performing some operation under HtmlRowPrepared event of aspxgridview. This is my sample code

double lPrice=0;
 protected void ASPxGrd_HtmlRowPrepared(object sender, ASPxGridViewTableRowEventArgs e)
 {
     if (e.VisibleIndex >= 0)
     {
        for (int i = 0; i < ASPxGrd.VisibleRowCount; i++)
        {
            ASPxTextBox txtPrice= ASPxGrd.FindRowCellTemplateControl(i,
               ASPxGrd.Columns["Price"] as GridViewDataColumn, "txtPrice") as ASPxTextBox;
            lPrice+= double.Parse(txtTotLinePrice.Text);
        }
          txtOutTax.Text=lPrice.ToString(); // Text box which is out side the gridview
     }
 }

I tried in many ways but still unable to assign the text box text but when I debug it and see I am able to see the text assigning to the text box, but when coming to form I couldn't. I also set EnableCallBack=False for the ASPXGridview even though issue remains same. Can some one help me