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"Object reference not set to an instance of an object.".....error

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.".....error
private void showClientListForUser()
string[] fkeys = new string[2];

fkeys[0] = txtUserName.Text;
fkeys[1] = txtUserCompanyNumber.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];
if anyone can help me to correct this error?
Sep 27 '07 #1
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