Use of Multiple Test Expressions in an 'If' Statement

Can anyone clarify for me please, as to whether you can specify more than one expression in the test part of an 'If' statement. I would like to check for two, or more, conditions in my 'If' statement. In the case the none of the conditions are met, I want the same 'else' statement to be executed. I have tried various techniques: if(test1) _____if(test2) MessageBox.Show("HelloWorld"); else MessageBox.Show("GoodbyeWorld"); if(test1) { _____if(test2) MessageBox.Show("HelloWorld"); } else MessageBox.Show("GoodbyeWorld"); But have have come to the conclusion that I will have to repeat the else part twice, which surely cant be so. In VB you can do the following: If (Test1 = true) Or (Test2 = true) Then _____MessageBox.Show("HelloWorld") Else _____MessageBox.Show("GoodbyeWorld") End If Can someone put me out of my misery, in a kind and gentle way please!