CODEWITHSUNDEEP
c#asp.netcontrolsmaster-pages
peter
peter

Reputation: 153

Master Page Control access c#

In a master page I have an asp:TextBox with the id "txtMasterTextBox". I want to change this textbox's "Text" property from a child page when another textBox in this page with id "childTextBox" Text is changed. In the childTextBox_TextChanged() i have

TextBox tbTest = (TextBox)this.Master.FindControl("txtMasterTextBox");
tbTest.Text = childTextBox.Text;

I can see with the Text Visualiser that lbTest.Text was successfully changed, but in the actual textBox on the master page nothing changes. What is happening?

Upvotes: 0

Views: 3863

Answers (2)

Tim Schmelter
Tim Schmelter

Reputation: 460288

You have to provide a public property in your master as accessor for the TextBox. Then you just need to cast the Master property of the page accordingly.

in your master: 

public TextBox MasterTextBox { 
    get {
        return txtMasterTextBox;
    } 
}

in your child-page (assuming that the type of your master is MyMaster):

((MyMaster) this.Master).MasterTextBox.Text = childTextBox.Text;

However, this is just a cleaner way than your FindControl approach, so i'm not sure why the TextBox doesn't show your changed text. Maybe it's a DataBind issue on postbacks.

An even better way would be not to expose the control in the property but only it's Text. Then you could change the underlying type easily. Consider that you want to change the type from TextBox to Label later. You would have to change all content pages with FindControl, you would not even get a compiler warning but a runtime exception. With the proeprty approach you have compile time check. If you even change it to a property that just gets/sets the Text of the underlying control, you could change it without changing one of your content pages at all.

For example:

public String MasterTextBoxText { 
    get {
        return txtMasterTextBox.Text;
    }
    set {
        txtMasterTextBox.Text = value;
    }
}

and in the content-page(s):

((MyMaster) this.Master).MasterTextBoxText = childTextBox.Text;

Upvotes: 2

Sagar Hirapara
Sagar Hirapara

Reputation: 1697

you have to do this

In master page.

    Master:  <asp:TextBox ID="txtMasterTextBox" runat="server"></asp:TextBox>
In Child Page.

 child:  <asp:TextBox ID="childtxt" runat="server" ontextchanged="childtxt_TextChanged" **AutoPostBack="true"**></asp:TextBox>

than in Textchange event of child textbox 
 protected void childtxt_TextChanged(object sender, EventArgs e)
        {
            TextBox tbTest = (TextBox)this.Master.FindControl("txtMasterTextBox");
            tbTest.Text = childtxt.Text;

        }

**so basiclly u have to put one attribute "AutoPostback" to True**

Upvotes: 2

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