Forms Data Controls :: Textbox Values Of Gridview Are Always Empty?

I am using gridview control in asp.net and doing insertion using template field in gridview. In c# i am getting those textbox values by type casting and id should return a integer value. i enter values in all fields of gridview and giving a command name as AddNew to insert the new values, insertion takes place but all fields are empty and id field is 0. how to take the values from textbox and also i should return a integer value for id. i paste my code below.

protected void OnRowCommand(object sender, GridViewCommandEventArgs e)
{
TextBox txtNewName = (TextBox)GridView1.FooterRow.FindControl("txtNewName");
TextBox txtNewpwd = (TextBox)GridView1.FooterRow.FindControl("txtNewpwd");
TextBox txtNewId = (TextBox)GridView1.FooterRow.FindControl("txtNewId");
TextBox txtNewEmail = (TextBox)GridView1.FooterRow.FindControl("txtNewEmail");
TextBox firstName = (TextBox)GridView1.FooterRow.FindControl("txtNewFirstName");
TextBox lastName = (TextBox)GridView1.FooterRow.FindControl("txtNewLastName");
TextBox designation = (TextBox)GridView1.FooterRow.FindControl("txtNewDesignation");
if (e.CommandName.Equals("AddNew"))
{
int id = Convert.ToInt32(txtNewId.Text);.......