How to read excel column from C# which contains long characters?

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C#

I want to read excel file from C# and fill the data to a DataTable. I have written the code as below.

string strNewPath = Server.MapPath("~/UploadExcel/" + "Action Center_Agent.xls");
 string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strNewPath + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
        // Create the connection object

        OleDbConnection oledbConn = new OleDbConnection(connString);
        try
        {
            oledbConn.Open();
            OleDbCommand cmd = new OleDbCommand("SELECT * FROM [Agent$A9:Z500]", oledbConn);
            OleDbDataAdapter oleda = new OleDbDataAdapter();
            oleda.SelectCommand = cmd;
            DataSet ds = new DataSet();
            oleda.Fill(ds, "Customer");
            DataTable dtExcel = new DataTable();
            dtExcel = ds.Tables[0];
         }
        catch
        {
        }
        finally
        {
           
            oledbConn.Close();
        }

Everything is working fine. But the problem is that the excel sheet contains a column which contains 80 characters. It is not able to read all the charactes of that colums.It is reading 60 characters and remaining characters are getting skipped . So can u please help me how to read complete column name please ?