Object reference not set to an instance of an object.

KAJAL TANEJA

10y3.3k.NET

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

12 Replies

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Rojalin Sahoo10y ago
Is your RadioButton2 is inside any Container like gridview , Datalist etc.
0
narasimman g10y ago
Just a quick thought. correct me if am wrong. Is this because you are trying to access inside Static method ? publc string[] getArea() { }
0
KAJAL TANEJA10y ago
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?
0
narasimman g10y ago
Can you check. rb1 is not null if(rb1 !=null) { }
0
KAJAL TANEJA10y ago
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 variables,and i cannot change that.
0
Ravi Patel10y ago
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("prefixText",2,check);// 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;
}
}
0
KAJAL TANEJA10y ago
Tried.Still same error:(
0
Manas Mohapatra10y ago
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.
0
KAJAL TANEJA10y ago
No sir it is giving me the same error.
0
Ravi Patel10y ago
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;
}
}

0
KAJAL TANEJA10y ago
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.
0
Manas Mohapatra10y ago
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).
0