I am new in php and in this registration form I am getting the following error in following code.:
1. Notice: Undefined index: gender..
2. Notice: Array to string conversion in the line of mysql query... 
I have given name to radio button still it is showing undefined index. and second one is array to string conversion in mysql query i am not able to understand what's going wrong. please help me and thank u in advance.
    <?php
    include_once 'conn.inc';
     if(isset($_POST['btnsave']))
     {
        $allowedExts = array("gif", "jpeg", "jpg", "png");
    $temp = explode(".", $_FILES["file"]["name"]);
    $extension = end($temp);
    if ((($_FILES["file"]["type"] == "image/gif")
    || ($_FILES["file"]["type"] == "image/jpeg")
    || ($_FILES["file"]["type"] == "image/jpg")
    || ($_FILES["file"]["type"] == "image/png"))
    && ($_FILES["file"]["size"] < 40000)
    && in_array($extension, $allowedExts))
      {
      if ($_FILES["file"]["error"] > 0)
        {
        echo "Return Code: " . $_FILES["file"]["error"] . "<br>";
        }
      else
          {
          move_uploaded_file($_FILES["file"]["tmp_name"],
          "upload/" . $_FILES["file"]["name"]);
          $_SESSION['image']=$_FILES["file"]["name"];
          }
      }
      else {
          echo "fail";
      }
        $name=$_POST['txtname'];
        $fname=$_POST['txtfname'];
        $gender=$_POST['gender'];
        $image=$_FILES['file'];
        $des=$_POST['designation'];
        $job=$_POST['txtjob'];
        $country=$_POST['txtcont'];
        $state=$_POST['txtstate'];
        $city=$_POST['txtcity'];
        $email=$_POST['txtemail'];
        $csatuts=$_POST['contactno'];
        $esatuts=$_POST['email'];
        $contact=$_POST['txtno'];
        $query="insert into tblregistration values('','$name','$fname','$gender','$image','$des','$job','$country','$state','$city','$contact','$csatuts','$email','$esatuts') " or die('error');
        $res= mysql_query($query);
        if(mysql_affected_rows())
        {
            $e= "You are successfully registered!!!";
        }
     }
    ?>
HTML part
<div id="content">
     <div class="box"><div class="heading">Registration</div></div>
     <div class="reg">
     <form action="registration.php" method="post" enctype="multipart/form-data">
        <table cellpadding="5px" cellspacing="5px">
            <tr>
                <td><label for="txtname">Name</label></td>
                <td><input type="text" name="txtname" value="Enter your name"  class="tb22"/></td>
            </tr>
            <tr>
                <td><label for="txtfname">Father's Name</label></td>
                <td><input type="text" name="txtfname" value="Enter your father's name" class="tb22" /></td>
            </tr>
            <tr>
                <td><label>Gender</label></td>
                <td>Male<input type="radio" name="gender" value="m"/>  
                Female<input type="radio" name="gender" value="f"  /></td>
            </tr>
            <tr>
            <td>
                <input onchange="readURL(this);" type="file"  name="file" /></td>
                 <td><img alt="Image Display Here" id="test" src="./upload/icon3.jpg" height="100px" width="100px"  /></td>
            </tr>
            <tr>
                <td><label>Designation</label></td>
                <td><select name="designation" class="tb22">
                    <option value="-1">Select Designation</option>
                    <option value="employed">Employed</option>
                    <option value="selfemployed">Self-Employed</option>
                    <option value="Retired">Retired</option>
                </select></td>
            </tr>
            <tr>
                           <td><label for="txtjob">Title of JOB</label></td>                
                            <td><input type="text" name="txtjob" value="Title of job" class="tb22" /></td>
            </tr>
            <tr>            
                             <td><label for="txtcont">Country</label></td>
                            <td><input type="text" name="txtcont" class="tb22" value="Enter your Country"/></td>
            </tr>
            <tr>    
                     <td><label for="txtstate">State</label></td>
                    <td><input type="text" name="txtstate"  value="Enter your state" class="tb22"/></td>
            </tr>
            <tr>    
                     <td><label for="txtcity">City</label></td>
                    <td><input type="text" name="txtcity" value="Enter your city"  class="tb22"/></td>
            </tr>
            <tr>
                <td><label for="txtno">Contact No.</label></td>
                <td><input type="number" name="txtno" value="Enter your no." class="tb22" />   <i>private</i> <input type="radio" name="contactno"  value="0" />  <i>public</i> <input type="radio" name="contactno" value="1" /></td>
            </tr>
            <tr>
                <td><label for="txtemail">Email</label></td>
                <td><input type="email" name="txtemail" value="Enter your email" class="tb22" />   <i>private</i> <input type="radio" name="email"  value="0" /> <i>public</i>  <input type="radio" name="email" value="1" /></td></td>
            </tr>
        </table>
        <input type="submit" name="btnsave" value="submit" class="tb20" />
     <?php if(isset($e))
     { echo "$e";} 
        ?>   
     </form>
 
     
     
    