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How to read SQL Server COUNT from SqlDataReader in C#?

There are many ways to get the SQL Server Count from SQL Data Reader.

First Example

if (sqlDataReader.Read()) {
  count = sqlDataReader.GetInt32(0);

Second Example

string sql = "SELECT COUNT(*) FROM [DB].[dbo].[tableExample]";
SqlCommand cmd = new SqlComman(sql, connectionString);
int count = (int)cmd.ExecuteScalar();

Third Example

SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable results = new DataTable("SearchResults");
lblMsg.Text = results.Rows.Count + " Rows Found.";

Complete Example

    SqlConnection conn = new SqlConnection("Database=student;Server=.;user=sa;password=aaaaaaa");
        SqlCommand cmd = new SqlCommand("SELECT * FROM Cars", conn);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        if (da.Read()) {
          count = da.GetInt32(0);
    catch (SqlException ex)
        // Display any errors...  
        // Close connection...  


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