Object Reference not set to an Instance of an object

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C#

ASP.NET

Hi All,

this is the code i wrote to get the text value from a textbox which i created dynamically inside a repeater.i wrote the following code in the repeater item bound event.

if (((TextBox)rptItem.FindControl(acheivedTxtContolID)).Text != null)
 {
    TextBox txtAchivements = (TextBox)rptItem.FindControl(acheivedTxtContolID);
 }                           

acheivedTxtContolID will give my textbox's controlId which wis unique.when i am debugging, the first line in the code is throwing error saying object reference not set to an instance of an object.that is when i am checking whether the textbox is null its giving the error.

if (((TextBox)rptItem.FindControl(acheivedTxtContolID)).Text != null)

i am putting the textbox as null but the code should go out of the condition if the textbox is null.instead its throwing error.what may be the cause.Can anyone provide some solutions to overcome this error.