how to set the length of string

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C#

SqlDataSource

i have the store procedure and i have passed the value as output which will return the value as string but the string is showing only length of 1 but on store procedure i have set the length(max) but the output is still single
eg the output should be mr-01-1 but only showing m

the store procedure is called as

SqlParameter[] param1 = new SqlParameter[1];

           var a = string.Empty;

           List<Object> objParamDetails = new List<Object>();

           SqlParameter MemberId = new SqlParameter("@MemberId", a);
           MemberId.Direction = ParameterDirection.Output;
           param1[0] = MemberId;

DataTable dt1 = new DataTable();
dt1 = CDataAccessLayer.GetDataTable("sp_5_43_GetCashReceivedPrint", param1, string.Empty, ref objParamDetails);