invalid column usrname1 was the error foru update() can some one suggest

 
protected void CreateUserWizard1_CreatedUser(object sender, EventArgs e)
    {
        TextBox TextBox1 = (TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("UserName");


        Session["usrnm"] = TextBox1.Text.ToString();
        Label1.Text = Session["usrnm"].ToString();


        Label2.Text = Session["phone"].ToString();
      
    }
    
     
   
   
    protected void CreateUserWizard1_ContinueButtonClick(object sender, EventArgs e)
    {
        
        SqlD ...