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Adapter.InsertCommand.Parameters.AddWithValue NullReferenceException

Posted on 2012-03-25
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Last Modified: 2012-03-28
Ok, I have an issue that I cannot seem to grasp. As per the title of the post, I am receiving a NullReferenceException when I access a stored procedure from a DataGridView in a C# application. The line of code that keeps throwing the exception is:
this.spPullAssignedAssetsTableAdapter.Adapter.InsertCommand.Parameters.AddWithValue("@aUser", Variables.userName);

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userName is coming from a class called variables. The call for that variable is:
public class Variables
    {
        public static string userName;
    }

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The ultimate conclusion to this task is to pass the userName variable to the stored procedure connected in the data adapter.

I have no idea what I am doing wrong. Following the debugger, I can see that the variable is being passed through correctly, but i have no idea why the NullReferenceException is being thrown.

Thank you for your time and any help is greatly appreciated.
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Question by:Sirjacksinurbox
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6 Comments
 
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Expert Comment

by:sachitjain
ID: 37764825
How is this.spPullAssignedAssetsTableAdapter.Adapter.InsertCommand? How are you setting it in your code?
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Author Comment

by:Sirjacksinurbox
ID: 37769605
Do you mean how is the above line of code being called?

If so, its being called in the frmAssetsAssigned.Designer.cs code.

Nothing I have (any variable associated with this line of code, including the variables in the stored procedure) have any null reference associated with them.

If I need to move it away from the Designer.cs , any direction would be greatly appreciated.

Thanks.
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LVL 12

Expert Comment

by:sachitjain
ID: 37769954
I mean you are appending parameter for this.spPullAssignedAssetsTableAdapter.Adapter.InsertCommand object but before that have you checked nullability of this object? In other words, this object (InsertCommand) for desired Adapter object should be set to some not null reference before we set its parameters.
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Author Comment

by:Sirjacksinurbox
ID: 37771160
Oh, I see.

Forgive me for sounding like a complete novice (for which I pretty much am), but how do you set that variable to something else before you assign the variable to it? (Especially since it takes two parameters)

Also, would it make more sense to place this line of code in the form load method of that form, instead of the Designer.cs?
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Accepted Solution

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sachitjain earned 500 total points
ID: 37771200
I would suggest check its nullability in your form load event like
if(this.spPullAssignedAssetsTableAdapter != null)
{
      if(this.spPullAssignedAssetsTableAdapter.Adapter != null)
      {
            if(this.spPullAssignedAssetsTableAdapter.Adapter.InsertCommand == null)
            {
                  this.spPullAssignedAssetsTableAdapter.Adapter.InsertCommand = <<Creation logic>>
            }
            Next steps..
      }
}
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Author Closing Comment

by:Sirjacksinurbox
ID: 37779777
It wasn't exactly what I was looking for, but it gave me the idea to look to LINQ instead.

Thank you.
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