can not access Dynamic Textbox inside gridview

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C#

Hello

I have Created multiple text boxes inside gridview at run time.
I have done this successfully.Now I want add a value to text box and save it.
but I am getting null when I call the control.

Following is my code

if (e.Row.RowType == DataControlRowType.DataRow)
     {
         for (int i = 0; i >4; i++)
         {
             TextBox txt = new TextBox();
             txt.CssClass = "SmallTextBoxDate";
             txt.Attributes.Add("runat", "server");
             txt.EnableViewState = true;
             txt.ID = "TextBox"+ (i).ToString();
            
             e.Row.Cells[i].Text = "";
             e.Row.Cells[i].Controls.Add(txt);


         }

now at save button when i try to access value I get null value.

TextBox txtname = ((TextBox)gvEmployee.FindControl("TextBox[1]"));// I get null here
string a = txtname.Text;

Reading many posts I have also recreate the control at postback, but after creating control i add value and then again button click event we get no controls.Pls help I have spend weeks on this.