خطا network name is no longer available

سلام دوستان میخواستم بدونم که خطای زیر معنیش چی هست؟
و این که علتش چیه؟
و نهایتن این که چطور میشه حلش کرد؟
*ـ* من خیلی گشتم اما این خطا در فروم اصلا نبود *ـ*

A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)

کدی که من نوشتم و این خطا رو میده:



string connectString1 = "Data Source=000.000.000.000;Initial Catalog=databasename;User ID=userlogin;Password=passwordlogin;Persist Security Info=True";

for (int i=0;dataGridView1.Rows.Count-1>i;i++)
{


string commandText1 = "select cid from jadval where cid=N'" + dataGridView1.Rows[i].Cells[0].Value.ToString() + "'";
try
{
using (TransactionScope scope = new TransactionScope())
{
using (SqlConnection connection1 = new SqlConnection(connectString1))
{
if (connection1.State == ConnectionState.Closed)
{
connection1.Open();
}
DataTable dt = new DataTable();
SqlDataAdapter aadb = new SqlDataAdapter("select cid from jadval where plk=N'" + dataGridView1.Rows[i].Cells[4].Value.ToString() + "'", connection1);
aadb.Fill(dt);
if (dt.Rows.Count == 0)
{
string commandText2 = "INSERT INTO jadval (tvd,shm,shsh,plk,clr,cpn,mob,shb,shs,dtv,pnb,odt, dcb,cid,jbja,gng,rid,gpn,dcs,dgd,emza,uid,ddpc,drp c,num,trkhd,trkht) VALUES(N'" + dataGridView1.Rows[i].Cells[13].Value.ToString() + "',N'" + dataGridView1.Rows[i].Cells[2].Value.ToString() + "',N'" + dataGridView1.Rows[i].Cells[3].Value.ToString() + "',N'" + dataGridView1.Rows[i].Cells[4].Value.ToString() + "',N'" + dataGridView1.Rows[i].Cells[5].Value.ToString() + "',N'" + dataGridView1.Rows[i].Cells[6].Value.ToString() + "',N'" + dataGridView1.Rows[i].Cells[7].Value.ToString() + "',N'" + dataGridView1.Rows[i].Cells[8].Value.ToString() + "',N'" + dataGridView1.Rows[i].Cells[9].Value.ToString() + "',N'" + dataGridView1.Rows[i].Cells[10].Value.ToString() + "',N' ',N' ',N' ',N'0',N'0',N'" + dataGridView1.Rows[i].Cells[16].Value.ToString() + "',N'0',N'" + dataGridView1.Rows[i].Cells[18].Value.ToString() + "',N' ',N' ',N'" + dataGridView1.Rows[i].Cells[21].Value.ToString() + "',N'0',N' ',N' ',N'0',N' ',N' ')";
if (connection1.State == ConnectionState.Closed)
{
connection1.Open();
}


SqlCommand command2 = new SqlCommand(commandText2, connection1);
command2.ExecuteNonQuery();

}
}
scope.Complete();
}
}
catch (SqlException ex)
{
MessageBox.Show("SqlException Message:" + ex.Message + "", "خطا");
}
}


خطا network name is no longer available


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