Error when compiling?

Question

How could I fix the error upon compiling the short code.

Here is the code:

 private void button1_Click(object sender, EventArgs e)
 {
      int a = 5;
      MessageBox.Show(a.ToString);
 }

It gives me back this 2 errors:

Error 1 The best overloaded method match for 'System.Windows.Forms.MessageBox.Show(string)' has some invalid argumentsError 2 Argument 1: cannot convert from 'method group' to 'string'

Any idea?

score 3 · Accepted Answer · edited May 23 '17 at 12:21

You are missing () at the end of ToString

MessageBox.Show(a.ToString());

The error you are getting:

Argument 1: cannot convert from 'method group' to 'string'

That is because MessageBox.Show expects a string type parameter and since you forgot to specify () at the end, a.ToString is a method group.

Got the following for Method group by Marc Gravell from a question on Stackoverflow.

A method group is the name for a set of methods (that might be just one) - i.e. in theory the ToString method may have multiple overloads (plus any extension methods): ToString(), ToString(string format), etc - hence ToString by itself is a "method group".

score 2 · Answer 2 · answered Mar 01 '13 at 07:40

2

you lack () in the ToString() method,

private void button1_Click(object sender, EventArgs e)
 {
      int a = 5;
      MessageBox.Show(a.ToString()); // <<== HERE
 }

answered Mar 01 '13 at 07:40

John Woo

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Error when compiling?

2 Answers2