Insert List Item using CAML and SPQuery ?

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C#

ASP.NET

.NET

SharePoint

CAML

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Hi , i want to ask that how can we insert list item in share point existing list using CAML and SPQuery.Query in server object model , is their any way to write query to insert and update it i have read and delete the item using this but i can't find any means to do add and update .. the code is :

SPWeb mySite = SPContext.Current.Web;

            SPList li = mySite.Lists["List"];

            SPQuery oQuery = new SPQuery();

            oQuery.Query = string.Concat("<Where><Eq>",
                                                    "<FieldRef Name='ID'/>",
                                                    "<Value Type='Number'>", TextBox7.Text.ToString() ,"</Value>",
                                         "</Eq></Where>");





            oQuery.ViewFields = string.Concat(
                                   "<FieldRef Name='ID'/>",
                                   "<FieldRef Name='Title'/>",
                                   "<FieldRef Name='Email'/>",
                                   "<FieldRef Name='Department'/>");

            oQuery.ViewFieldsOnly = true;


            SPListItemCollection collListItems = li.GetItems(oQuery);

            int j = collListItems.Count;

            for (int i = 0; i < j; i++)
            {
                collListItems[0].Delete();
                cc.Text = "Deleted";
            }

Also , i have found this while searching for the solution

<Batch OnError="Continue">
        <Method ID="1" Cmd="New">
         <Field Name="WikiField">My Wiki Content</Field>
        </Method>
      </Batch>

please assist me with your solutions and ideas ?