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"Object reference not set to an instance of an object.".....er ror

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i wrote the following code to get a specific data row from the data set.but it generates the
"Object reference not set to an instance of an object.".....er ror
private void showClientListF orUser()
string[] fkeys = new string[2];

fkeys[0] = txtUserName.Tex t;
fkeys[1] = txtUserCompanyN umber.Text;

DataSet ds = new DataSet();
DataRow dr = null;

for (int i = 0; i < dsMain.Tables["UserClient "].Rows.Count; i++)
dr[i] = dsMain.Tables["UserClient "].Select("UserID ="+"'"+fkeys[0]+"'"+ "and CompNo= " + fkeys[1]);------//this line throws the error i told.

// dr = ds.Tables[0].Rows[i];
lvwClientsForUs er.Items.Add(Co nvert.ToString( dr["CompNo"]));
lvwClientsForUs er.Items[i].SubItems.Add(C onvert.ToString (dr["ClientNo"]));
lvwClientsForUs er.Items[i].SubItems.Add(C onvert.ToString (dr["CNAME"]));
if anyone can help me to correct this error?
Sep 27 '07 #1
0 1283

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