Web Forms :: Find Control In Master Page

Apr 1, 2010

i am using master pages. i want to use findcontrol. but i am not getting expected result. my scenario:

Master Page--> ContentPlaceHolder-->Html Table-->Panel-->placeholder--> here i am dynamically generating textbox controls.

i am using following syntax:

TextBox txtAmt = (TextBox)this.Master.FindControl("EmpJobInfo_Content").FindControl("GBTable").FindControl("PanGB").FindControl("PlaceHolder1").FindControl("tbl").FindControl("txtinstallment");

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I've tried this:

[Code]....

[Code]....

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but below error happen:

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.Source Error: 

Line 13:
Line 14: (this.Master.FindControl("ADMenuMessage") as HtmlGenericControl).Style["background-image"] = Page.ResolveUrl("~/Image/ADactivmenu.png");
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Line 17: }

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[Code]....

code of master page 2

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MasterPage.aspx

[Code]....

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[code]....

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