Reference 10 for the using directive or assembly

Re-use the ** prompt to type this sentence, is this (page) object does not have a member of gridview1, or you got the name wrong, go to the designer to check.

The aspx file does not have an element defined as GridView1.

The first step is to check whether the namespace name corresponding to using exists, which is mostly due to this reason.

The second step, the right solution explorer - references; Right-click reference - add reference.

Step 3: Open the options on the left and find the dll you need to reference.

You may have removed that widget, so it's still in event handling, and this error will occur! You should delete that event and that's it! Hope it helps.

It's the lack of references! You can't see what citations are missing! All you have to do is add a reference and then add using to the head of your program as well... That's it!

rblprogramkind

Do you look at the name of that control, are you sure it's this?

Is it a running error or a generation error?

Go to form5 and form7 to see if the namespace is correct. The namespace needs to be the same as form1 to be used in this way.

Check if the form is in a namespace, if not, reference the namespace, or change it to the same.

In fact, just post the error prompt, "whether there is a missing using directive or assembly reference" is what is said before, what is missing the using directive.

If there is an error, hover over the class with a red wavy line, and then a small box will appear, click to add a reference. If you don't have this option, it doesn't matter if you quote it.

If the dataoper type is missing, you need to reference it earlier.

Namespace. I don't know which namespace exactly.

Add this paragraph to the namespace

For data type 2, try class

datatypetest

skype4comlib。It's a dll or something, right?

Now register in the system: Enter it in the "Run" field.

regsvr32

The absolute path of the file.

For the project "Add Reference", select com, and there should be the component you just registered underneath. Selected.

Recompilation.

If you don't have anything, you can add a reference, select the class name, you can drop it down, and add it directly.

Or write it manually:

using caipiaochaxun;

In Solution Explorer, click References --Invert to Add References --Select Browse to Add Files to the Project.

What are your Chinese things?

Write it in your own framework.,Copy all the using from other pages.,You didn't say which line ** was wrong.,It's hard to judge which reference is missing.。

used someone else's using caipiaochaxun; You also need to add a corresponding dll reference.