Need Help with DataList TextBox

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C#

ASP.NET

I have a datalist that has a textbox in the edit item template and i can set the text propery of the txtbox but whenever I run my app and type something in the textbox and run my updatye command the textbox text is empty or null.

here is my updatye command

protected void Update(object source, DataListCommandEventArgs e)
{
    if (!IsPostBack)
    {
        DataList1.DataBind();

        SqlCommand cmd1 = new SqlCommand("Update install_Add_Test set installName = '" + ((TextBox)e.Item.FindControl("editInstallName")).Text.ToString() + "' where id = '1'", cs);
        cs.Open();
        cmd1.ExecuteNonQuery();
        //Response.Write(editInstallName);


        cs.Close();
        //Response.Redirect("DatalistTest.aspx");
        //DataList1.DataBind();

        DataList1.EditItemIndex = -1;

    }

I didn't want to put all of my code in this post but if I need to I can. It just seems like the textbox.txt value should change whenever I type something in it and hit my update link button. Please let me know if more info is needed. Thanks in Advance.