visual basic search

What SQL statement can help me with this program to search for a name I type in a text (txtPatNm) and put a check mark in the appropriate box either patient found or not found.  My program below is not working? Why? My database table is called DoctorPatInformation and the field with the patient Name is called PatName.  I linked the database with the form by using the data button and also the text with the PatName field.

MyString = txtPatNm.Text
strSQL = "SELECT PatName, FROM DoctorPatInformation WHERE PatName = MySring"
Data1.RecordSource = strSQL
 If strSQL = MyString Then
 chkPatFound.Value = 1
 chkPatNotFound.Value = 1
 End If
 'Data1.RecordSource = "SELECT * FROM DoctorPatInformation "
End Sub

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    strSQL = "SELECT PatName FROM DoctorPatInformation WHERE PatName = " & MySring

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You can use:
strSQL = "SELECT PatName FROM DoctorPatInformation WHERE PatName = '" & txtPatNm.Text & "'"
It looks to me as if the problem is also in the compare statement "If strSQL = MyString" strSQL is set to your SQL statement, and MyString is set to whatever is typed in the textbox.  Nothing is returned to the control until the data1.refresh.

Also you need ro do a data1.refresh after you change the RecordSource Property.
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