在ASP.Net中调用两次存储过程时发生TimeOut异常

我有一个函数，当我在gridview中单击项目时调用。该函数调用存储过程。函数是，

void fp_GetMRVByItem(int ItemID)
    {
        DTMRVdetails = null;
        MIVP.ItemID = ItemID;
        MIVP.SubCategoryID = Convert.ToInt32(hfSubCategory.Value); //SubCategoryID;
        MIVP.MIVTypeID = Convert.ToInt16(hfMIVTypeID.Value);
        if (hfMIVTypeID.Value == "2")
        {
            if (gvMIVMRV.Rows.Count > 0 && DTMIVMRV.Rows.Count > 0)
            {
                MIVP.CustomerID = Convert.ToInt32(DTMIVMRV.Rows[0]["CustomerID"].ToString());
                MIVP.JobOrderID = Convert.ToInt32(DTMIVMRV.Rows[0]["JobOrderID"].ToString());
            }
            else
            {
                MIVP.CustomerID = Convert.ToInt32(hfCustomerID.Value);
                MIVP.JobOrderID = Convert.ToInt32(hfJobOrderID.Value);
            }
            DTMRVdetails = MIVBLL.MRVGridLoad(MIVP);//This call works perfectly.But when i moved flow moved into
            // the following if I reset values to CustomerID,JobOrderID and again call the SP.Here I get
            // the exception
            //Timeout expired.The timeout period elapsed prior to completion of the operation or the server is not responding.
            if (DTMRVdetails.Rows.Count == 0 && gvMIVMRV.Rows.Count == 0)
            {
                MIVP.CustomerID = -1;
                MIVP.JobOrderID = -1;
                DTMRVdetails = MIVBLL.MRVGridLoad(MIVP);//Timeout expired.The timeout period elapsed prior to completion of the operation or the server is not responding.
            }
            fp_GridViewSource(gvMRVdetails, DTMRVdetails);
        }
        else
        {
            MIVP.CustomerID = Convert.ToInt32(hfCustomerID.Value);
            MIVP.JobOrderID = Convert.ToInt32(hfJobOrderID.Value);
            //if (gvMRVdetails.Rows.Count > 0)
            //    DTMRVdetails.Merge(MIVBLL.MRVGridLoad(MIVP), false, MissingSc6hemaAction.Ignore);
            //else
            DTMRVdetails = MIVBLL.MRVGridLoad(MIVP);
            //MRVMIVAccordion.SelectedIndex = 0;
            fp_GridViewSource(gvMRVdetails, DTMRVdetails);
        }
    }

我不明白这个问题的原因是什么。有人吗?