I am getting problem for data bind

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i bind the list box
i am getting error there is no row at position 6

if deleting 6 then there is no row at position 5

public void bindlistbox()
{
DataSet ds = new DataSet();
string query = "select FName from UserInformation";
SqlDataAdapter da = new SqlDataAdapter(query, c);
//da.SelectCommand.CommandType = CommandType.StoredProcedure;
// da.SelectCommand.Parameters.AddWithValue("@UserId", UserId);
//da.SelectCommand.Parameters.AddWithValue("@FName", fname);
da.Fill(ds);
for (int i = 0; i <= ds.Tables[0].Rows.Count; i++)
{

lstuser.Items.Add(ds.Tables[0].Rows[i]["FName"].ToString());

}

Posted 18-Feb-14 8:39am

Member 9425683

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NeverJustHere · Answer 1 · 2014-02-18T08:49:00

Solution 1

Change your for line to be:
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)

If your count is 6, you need to iterate 0 to 5 ie (0, 1, 2, 3, 4, 5)

Posted 18-Feb-14 8:49am

NeverJustHere

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Member 9425683 19-Feb-14 1:42am

this is right but if i am using this from 1 to 6 again error can you explain me

NeverJustHere 19-Feb-14 3:53am

The Row index is 0-based, not 1-based. This is why the for loop starts with i=0. When Rows.Count = 6, the 6 valid Rows[i] are where i = 0,1,2,3,4,5.

(Other languages would use 1-based arrays, but c# is 0-based)

If you try to access Rows[6], you are asking for the 7th Row, which doesn't exist - hence the error.

An alternate way of iterating through the Rows collection is to use the for each loop

Foreach (DataRow row in ds.Tables[0].Rows)
{
     lstuser.Items.Add(row["FName"].ToString());
}