to popluate a gridview from a database

we are using web application with Model View Presenter Pattern. To populate data in a grid view..getting records from database as array of string like  
public string[] GetAllUserGroups()
            return Roles.GetAllRoles();
i can see the value in the debug mode but
public string[] DataSource
            this.ASPxGridView1.DataSource = value; //i got value here
            this.ASPxGridView1.DataBind(); //here iam getting error
at databind,iam getting error like :
A field or property with the name 'RoleName' was not found on the selected data source.
pls help me......

in ascx file which contains 
<dxwgv:ASPxGridView runat="server" ID="ASPxGridView1" AutoGenerateColumns="False"
                                    EnableCallBacks="False" Width="200px" OnFocusedRowChanged="ASPxGridView1_FocusedRowChanged"> 
                                       <dxwgv:GridViewDataTextColumn Caption="Available Groups"  FieldName="RoleName"
                                            <CellStyle Wrap="False" ></CellStyle>
                                    <SettingsBehavior AllowFocusedRow="True" ProcessFocusedRowChangedOnServer="True" />
ascx.cs file:
public string[] DataSource
            this.ASPxGridView1.DataSource = value;
 string[] DataSource { set;}
presenter :
base.View.DataSource = this._controller.GetAllUserGroups();
controller contains
 public string[] GetAllUserGroups() 
            return Roles.GetAllRoles();

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it seems that you have a column names "RoleName" which is non existent in your datasource... better check the source.
Yeah as carisiy says check if your select query has the column RoleName selected.

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