Object reference not set to an instance of an object.

Question

Hi i am trying to check whether my RadioButton is checked or not in a method.If checked execute some code else execute another code. But when i debug it I am getting this error Object reference not set to an instance of an object I have gone through many links but not able to correct it. Below is my .aspx.cs code public static string[] GetArea(string prefixText int count) { RadioButton rb1 = RadioButton2; if (rb1.Checked == true) { //execute some code //return some value; } else { //execute some other code //return some value; } } RadioButton2 is defined in my .aspx page I am getting error at this line if ( rb1 . Checked == true ) Please help.Thankyou

Rojalin Sahoo · Answer

Is your RadioButton2 is inside any Container like gridview  Datalist etc.

narasimman g · Answer

Just a quick thought. correct me if am wrong. Is this because you are trying to access inside Static method ? publc string[] getArea() { }

KAJAL TANEJA · Answer

It is showing in the autos window that value of radiobutton is null.But how can it be so when i am checking the radiobutton?

narasimman g · Answer

Can you check. rb1 is not null if(rb1 !=null) { }

KAJAL TANEJA · Answer

Sir i am using ajax toolkit AutoCompleteExtender which returns me array of strings and ServiceMethod=GetArea that directly calls this method.Moreover GetArea can accept only prefixLength and count as variablesand i cannot change that.

Ravi Patel · Answer

Radio button value available only on button click code. try this way protected void Button1_Click(object sender EventArgs e) { var check = RadioButton1.Checked; var res = GetArea(prefixText2check);// change the return type } private object GetArea(string p1 int p2 bool check ) // { if check == true) { //execute some code //return some value; } else { //execute some other code //return some value; } }

KAJAL TANEJA · Answer

Tried.Still same error:(

Manas Mohapatra · Answer

Then it is problem with RadioButton2. Copy the code for back up. And delete RadioButton2 from aspx file then clean the solution. Again open aspx page and drag drop radiobutton from tollbox to aspx page. Then build the solution and check if you are getting same error. Secondly anywhere is it hiding or deleting from page using javascript or code-behind. Just cross check by searching with the id  RadioButton2  where it is being used.

KAJAL TANEJA · Answer

No sir it is giving me the same error.

Ravi Patel · Answer

Hi try this public static string[] GetArea(string prefixText int count) { if ( RadioButton2 .Checked == true) { //execute some code //return some value; } else { //execute some other code //return some value; } }

KAJAL TANEJA · Answer

Sir when i am checking it directly i.e (RadioButton2.Checked==true) It is giving me the same error. So i am trying to do so by object.

Manas Mohapatra · Answer

You are getting error you are assigning RadioButton2 object to rb1 and rb1 is not instantiated yet. So it is throwing you exception. Try with below code: RadioButton rb1 = new RadioButton(); rb1 = RadioButton2; Secondly I am not sure why are you assigning RadioButton object to another. You can check it directly( RadioButton2.Checked == true).