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If you want to do this from any form (not the mdi parent) then use<br />
<br />
For each frm As Form In My.Application.OpenForms<br />
&nbsp; &nbsp; &nbsp;If Typeof(frm) is frmMyForm Then<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;frm.Activate<br />
&nbsp; &nbsp; &nbsp;End If<br />
Next
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<div class="content wysiwyg-content">
How to Refresh a Mdi Child Form if it is already open
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How to Refresh a Mdi Child Form if it is already open

If you want to do this from any form (not the mdi parent) then use

For each frm As Form In My.Application.OpenForms
     If Typeof(frm) is frmMyForm Then
         frm.Activate
     End If
Next

reload a Mdi Child Form if it is already open

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,