I am trying to a viewdate in code as can be seen below and i am getting the error message below, any ideas why this would be happening.
Code being used
var state = ViewState["GridViewIndex"].ToSting()
Error Message
Object reference not set to an instance of an object.
Use
var state = Convert.ToString(ViewState["GridViewIndex"]);
instead of ToString()
This won't crash when ViewState["GridViewIndex"] is null and just return null or string.Empty.
The reason why you're getting that error is because ViewState["GridViewIndex"] is not an instance of an object.
ViewState is like a dicionary, but for a given key you might get a null reference, if no object is instantiated. Please change your code to check for null references because convert it to string.
Something like
string state = string.Empty;
if(ViewState["GridViewIndex"] != null)
{
state = ViewState["GridViewIndex"].ToString();
}
or might also use Convert.ToString instead of ToString as RononDex told us, but in general we need to check for null references.
ViewState["GridViewIndex"] = 'get the value
var state = string.empty;
if(ViewState["GridViewIndex"] != null)
{
state = ViewState["GridViewIndex"].ToString();
}
Since you haven't assigned any values to the ViewState["GridViewIndex"] it throws an error Object reference not set to an instance of an object. so first assign a value then pass it to the variable state.
Hope this helps
Happy Coding
