AutoEventWireUp

AutoEventWireUp attribute in asp.net is used to call the Page_Load and Page_InIt methods automatically
by setting AutoEventWireUp=true;
By default AutoEventWireup set to true in machine.config and hence at the page level it is set to false
If you set AutoEventWireUp=true at page level then Page_Load and Page_InIt will be executed twice.

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User Control assignment ( Change Button color from User Control Text Box Value)

1.Create User Control with name Enquiry . Drag and drop Text box control on the Enquiry.ascx
    set text box id="tbColorName".
2.Create a property in the Enquiry.ascx.cs as shown below.
   protected void Page_Load(object sender, EventArgs e)
    {

    }
    private string _color;

    public string Color
    {
        get { return _color; }
        set { _color = value; }
    }
3.Create a Page with Name UserControlSample.aspx and do below given activities

• Drag and drop a button on the aspx page and set id="btnSubmit" Text="Submit"
• Drag and drop the User Control on to the surface of the aspx page. Set UserControl id="Enquiry1".

4.Write the below code in the UserControlSample.aspx.cs

protected void btnSubmit_Click(object sender, EventArgs e)

    {

        foreach (var c in Enquiry1.Controls)

        {

            Type t=c.GetType();

            if (t.Name=="TextBox")

            {

                Enquiry1.Color = ((TextBox)c).Text;

            }

        }

        btnSubmit.BackColor = System.Drawing.Color.FromName(Enquiry1.Color);

    }

5.Execute the application by pressing F5.