How to check and replace null value in C#

[lad1412]

private DataTable getSomething1(String text){
    DataTable dtb = new DataTable();
    ...
    ...
    return dtb;
}

...

protected void buttonCheck_Click(object sender, ImageClickEventArgs e){
    List<DataTable> dtList = new List<DataTable>(){
        getSomething(item1.Text),
        getSomething2(item2.Text),
        getSomething3(item3.Text),
        ...                
    };
}

Anyone can guide me a way to check and replace null values in dtList with String message "NO DATA" or allow them in dtList.
Because when I met a null value in this List,it show an error like "There is no row at position..."
I used C# in Webform

Thanks in advance.

[firexfighterx]

Can you show more code of more along the lines of what you want to accomplish? Then i will able to better come up with a solution.

[lad1412]

I have already find out a way to solve this error. Thanks

private String ConvertNullToEmptyString(DataTable element)
    {
        if (element.Rows.Count > 0) //just add this condition here
        {
            if (!DBNull.Value.Equals(element.Rows[0]["FullName"]))
                return (string)element.Rows[0]["FullName"] + " ";
            else
                return String.Empty;
        }
        return "NO DATA";
    }

protected void ....(){
     List<DataTable> strList = new List<DataTable>(){
       GetItem1(txtName.Text),   //
       GetItem2(txtName.Text),   //I set this datatable dont have any value           
     };

    txtBox1.Text = ConvertNullToEmptyString(strList[0]);
    txtBox2.Text = ConvertNullToEmptyString(strList[1]);
}