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# AA1301 - Variables Should Be Assigned Once Only #
**Report code: AA1301-VariablesShouldBeAssignedOnceOnly**

## Summary ##
<table>
<tr>
  <td><strong>Status</strong></td>
  <td>Implemented</td>
</tr>
<tr>
  <td><strong>Description</strong></td>
  <td>Variables should be treated as immutable and should not be overwritten</td>
</tr>
<tr>
  <td><strong>Category</strong></td>
  <td><a href="ImmutabilityAnalyzers.md">Immutability Analyzers</a></td>
</tr>
<tr>
  <td><strong>Enabled by default:</strong></td>
  <td>Yes</td>
</tr>
<tr>
  <td><strong>Severity:</strong></td>
  <td>Error</td>
</tr>
</table>

## Cause ##



## How to fix violations ##

There currently aren't any implemented code-fixes for this rule.

## How to suppress violations ##

This rule can be suppressed using the following attributes: 

**[MutableVariable]**<br/>A method annotated with MutableVariable attribute is allowed to have variables that change value (ie canbe reassigned. The variables affected must be named in the MutableVariable attribute attribute, eg
````cs
[MutableVariable attribute("var1")]
public void F()
{
    var var1 = 1;
var1 = 2;
}
````
Multiple variables can be supplied to the attribute, eg [MutableVariable attribute("var1", "var2")]