Hi I have master page and its childern pages.

For instance, if i have a label on the master page. 

I want to set its text property from the child page. how I can do that.  ?

Hi,

Try this:

            Label label1 = Master.FindControl("Label1") as Label;
            label1.Text = "Hello";

 Joe

 hi,

you can do it following way:

        Label lbl= (Label)this.Master.FindControl("controlId");
        lbl.Text = "new text";

is this to get the value  from master page or to assign the  value to a control in master page?

Where is this label located? 

aammiz:

is this to get the value  from master page or to assign the  value to a control in master page?

Where is this label located? 

Not sure what do you want, it seems that you want to know how to get(set) value from(to) a control,

Get:
Label label1 = Master.FindControl("Label1") as Label;
string strGetValue = label1.Text;

Set:
Label label1 = Master.FindControl("Label1") as Label;
label1.Text = "Set Value";

thanks for all your help