Microsoft KB Archive/138504

= PRB: "Data type mismatch" Error When Running a Form =

Article ID: 138504

Article Last Modified on 2/11/2000

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APPLIES TO


 * Microsoft Visual FoxPro 3.0 Standard Edition

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This article was previously published under Q138504



SYMPTOMS
One of the following error messages appears when running a form:


 * Data type mismatch. -or-


 * Error loading file - ControlSource - record number #. Data type is invalid for this property.



CAUSE
The memory variable created by the ControlSource property of one or more objects on the form is the same as the memory variable that refers to the form.



RESOLUTION
Either rename the form, or change the ControlSource value to something other than the name of the form.



STATUS
This behavior is by design.



MORE INFORMATION
All memory variables must be unique. When a form is run, a memory variable is created that has the same name as the form. When the ControlSource of an object evaluates to a memory variable, Visual FoxPro attempts to create a memory variable. Because a memory variable of the same name already exists, Visual FoxPro produces the error.

Steps to Reproduce Behavior

 * 1) Create a form called myform.
 * 2) Add a combo box.
 * 3) Set the ControlSource property of the combo box to myform.
 * 4) Run the form.

Additional query words: VFoxWin

Keywords: KB138504

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