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GeneralRe: How would you describe what an IEnumerable is to a bright student of C# Pin
jschell30-Jan-22 7:06
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GeneralRe: How would you describe what an IEnumerable is to a bright student of C# Pin
endo funk30-Jan-22 14:21
Memberendo funk30-Jan-22 14:21 
GeneralRe: How would you describe what an IEnumerable is to a bright student of C# Pin
jschell17-Feb-22 10:28
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GeneralRe: How would you describe what an IEnumerable is to a bright student of C# Pin
endo funk17-Feb-22 14:38
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QuestionC# filter database through comboboxes Pin
R-Berg21-Jan-22 1:20
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AnswerRe: C# filter database through comboboxes Pin
jsc4221-Jan-22 3:50
professionaljsc4221-Jan-22 3:50 
GeneralRe: C# filter database through comboboxes Pin
R-Berg21-Jan-22 5:59
MemberR-Berg21-Jan-22 5:59 
GeneralRe: C# filter database through comboboxes Pin
RobertSF22-Jan-22 8:15
professionalRobertSF22-Jan-22 8:15 
I think the solution is to use the same method for the SelectedIndex event in all three combo boxes. Then, regardless of which combo box is changed, the same method will fire. Upon firing, the method should construct a Filter string based on all three selections.

Incidentally, you can use interpolated string syntax for easier coding and reading.
matBaseBindingSource.Filter = $"USnumber = '{cmbBaseM.SelectedItem}'";

You can build complex filtering strings when you're using DataSets and DataTables. Check it out.
DataColumn.Expression Property (System.Data) | Microsoft Docs[^]
GeneralRe: C# filter database through comboboxes Pin
R-Berg24-Jan-22 1:37
MemberR-Berg24-Jan-22 1:37 
GeneralRe: C# filter database through comboboxes Pin
RobertSF24-Jan-22 8:55
professionalRobertSF24-Jan-22 8:55 
GeneralRe: C# filter database through comboboxes Pin
R-Berg25-Jan-22 22:56
MemberR-Berg25-Jan-22 22:56 
GeneralRe: C# filter database through comboboxes Pin
RobertSF26-Jan-22 10:18
professionalRobertSF26-Jan-22 10:18 
QuestionCalling new Process, path problems Pin
Member 1495533220-Jan-22 23:08
MemberMember 1495533220-Jan-22 23:08 
AnswerRe: Calling new Process, path problems Pin
Richard MacCutchan20-Jan-22 23:41
mveRichard MacCutchan20-Jan-22 23:41 
AnswerRe: Calling new Process, path problems Pin
OriginalGriff20-Jan-22 23:48
mveOriginalGriff20-Jan-22 23:48 
QuestionPrinting two panels on a card back and front Pin
Member 1509338120-Jan-22 4:36
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AnswerRe: Printing two panels on a card back and front Pin
OriginalGriff20-Jan-22 5:12
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GeneralRe: Printing two panels on a card back and front Pin
Member 1509338120-Jan-22 8:05
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GeneralRe: Printing two panels on a card back and front Pin
OriginalGriff20-Jan-22 8:12
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GeneralRe: Printing two panels on a card back and front Pin
Luc Pattyn20-Jan-22 9:05
sitebuilderLuc Pattyn20-Jan-22 9:05 
GeneralRe: Printing two panels on a card back and front Pin
RobertSF20-Jan-22 11:09
professionalRobertSF20-Jan-22 11:09 
Generalbtn event async await rtb and tb overlap and switch between them by tb.show and tb.hide Pin
Member 1356965020-Jan-22 4:31
MemberMember 1356965020-Jan-22 4:31 
GeneralRe: btn event async await rtb and tb overlap and switch between them by tb.show and tb.hide Pin
Dave Kreskowiak20-Jan-22 5:09
mveDave Kreskowiak20-Jan-22 5:09 
GeneralRe: btn event async await rtb and tb overlap and switch between them by tb.show and tb.hide Pin
Member 1356965020-Jan-22 5:20
MemberMember 1356965020-Jan-22 5:20 
GeneralRe: btn event async await rtb and tb overlap and switch between them by tb.show and tb.hide Pin
Dave Kreskowiak20-Jan-22 9:42
mveDave Kreskowiak20-Jan-22 9:42 

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